[INDEX.][56]
[56] The preparation and properties of the Chemicals used in Photography will be found in the Alphabetical List commencing at [page 327].
[[A]] [[B]] [[C]] [[D]] [[E]] [[F]] [[G]] [[H]] [[I]] [[K]]
[[L]] [[M]] [[O]] [[P]] [[R]] [[S]] [[T]] [[V]] [[W]]
Aberration, chromatic, [54];
spherical, [56].
Accelerating agents, their mode of action in Collodion explained, [95].
Acetate of Silver, its preparation and formula, [365];
its formation in Nitrate Bath explained, [89];
ensures absence of free Nitric Acid, [116];
tends slightly to favour fogging and spots, [104];
contra-indicated for glass Positives, [111].
Acetic Acid, properties and mode of testing purity of, [327];
useful in preventing fogging, [104];
in rendering the development slow and even, [99];
does not coagulate Albumen, [329];
a good commercial form of acid, [212];
Acetic Acid essential in Calotype, waxed paper, and Albumen processes, [177];
also in printing paper Positives by development, [260].
Aceto-Nitrate of Silver, term explained, [177].
Achromatic Lenses, their construction explained, [55];
the visual and chemical foci often coincident in, [60].
Acids, nature of, [308].
Actinism, explained, [61];
importance of distinguishing Actinic from visual rays, [62];
mode of finding Actinic focus, [229].
Affinity, chemical, [312].
Albumen, its chemistry, [328];
forms a compound with oxide of Silver, [20];
used in Positive printing to produce a fine surface layer, [122];
to increase sensitiveness, [125];
affects the colour of the prints, [127];
protects the image from oxidation, [150];
putrifies when exposed to moisture, [155];
discolours the Nitrate Bath, [245].
Albumen negative process, its invention, [10];
theory of, [180];
Collodio-Albumen process of M. Taupenot, [294].
Albuminized paper, formula for, [241];
slow in fixing, [131];
not well adapted for toning by Sel d'or, [269];
good for stereoscopic subjects and small portraits, [249];
cannot be sensitized with Ammonio-Nitrate of Silver, [246].
Alcohol, its chemistry, [330];
sometimes too dilute for making Collodion, [84];
mode of rectifying, [196];
must not contain impurities, [96];
effects of adding to Collodion, [84], [96];
to developer, [205].
Alkalies, nature of, [308].
Alkalinity of Nitrate Bath, explained, [88];
the evils it produces, [104];
how to test for it, [377];
how to remove it, [277].
Amber varnish, [226].
Ammonia, preparation and properties, [331];
its use in fixing, [42];
Mr. Shadbolt's formula for, [271];
its action upon Chloride of Gold, [343];
effect of concentrated Ammonia upon Oxide of Silver, [362].
Ammonio-Nitrate of Silver, its chemistry, [262];
used in Positive printing to increase sensitiveness, [125];
to give black tones, [127];
cannot be used with Albumen, [246];
increases permanency of print, [169];
old Nitrate Baths not easily convertible into Ammonio-Nitrate, [248];
mode of preparing, [247];
best applied to the paper by brush or rod, [248];
Oxide of Silver in Nitrate of Ammonia, a useful substitute for it, [249].
Ammonio-Nitrate paper, formula for, [246];
a more simple formula, but less sensitive than the last, [258].
Atomic theory explained, [322].
Bath for fixing and toning Positives. See [Fixing and toning Bath].
Bichloride of Mercury, whitening action on glass Positives explained, [113];
solution for, [207];
used to intensify Negatives, [118];
bleaches paper prints, [151];
should not be added to paste used in mounting prints, [164];
removes Silver stains, [377].
Binocular vision, phenomena of, explained, [66].
Blackening Negatives, [37], [117].
Black tones, mode of obtaining, in paper Positives, [168], [246].
Bromide of Silver, its preparation and properties, [17];
its superior sensibility to coloured light, [63];
less acted on by white light than Chloride, [19];
less sensitive to invisible image than Iodide, [25];
employment in Collodion, [101];
found useful in Photographing by artificial light, [66];
diagram of chemical spectrum on, [64].
Bromo-Iodide of Silver, [173].
Brushes, mode of applying Silver solutions by, [248].
Calotype process, theory of, [176].
Camera, its first invention, [7];
theory of its construction, [54];
mode of testing accuracy of, [229];
cause of the image being inverted, [53];
the term "flatness of field" explained, [54];
best position of the Camera for portraits, [220];
for architectural subjects, [231];
a funnel-shaped tube placed in front of the lens, [229];
stereoscopic Camera, [234];
microscope Camera, [236].
Causes of failure in Collodion process, [276].
Chemical affinity, illustrations of, [312].
Chemical elements, [306].
Chemical focus, directions for finding, [229];
shorter than visual in non achromatic lenses, [60];
longer than visual in microscopic objectives, [237];
varies slightly with the nature of the light, [238].
Chemical spectrum, [61].
Chemicals, Photographic, Vocabulary of, [327].
Chloride of Silver, its preparation and properties, [14];
more sensitive to white light than Bromide or Iodide, [19];
less sensitive to invisible image, [24];
its blackening by light explained, [20], [141];
accelerated by excess of Nitrate, [19];
by organic matter, [20], [142];
experiments illustrating darkening of papers prepared with, [21];
simple explanation of the mode of preparing sensitive papers with, [22];
agents which dissolve it, [42];
mode of reducing it to metallic state. 374.
Chloride of Gold, its preparation and properties, [342];
action of Ammonia upon it, [343];
use of an alkaline solution of, for toning, [132], [271];
compounds formed on adding it to Hyposulphite of Soda, [133];
mode of preparing the fixing and toning Bath with, [250];
the Sel d'or Bath with, [267].
Chromatic aberration, [54].
Citric Acid, forms a red compound with Suboxide of Silver, [21], [338];
used in printing to give purple tones, [128];
formula for preparing paper with, [246].
Cleaning glass plates, theory of, [39];
details of, [213].
Collodion, its discovery, [10];
chemistry of Pyroxyline, [75];
physical effect of Ether and Alcohol in, [83];
of water in, [85];
glutinosity of, [83];
coloration of iodized, explained, [85];
sensitiveness and intensity affected by the change, [97], [99];
details of manufacture of Collodion, [185];
Positive Collodion, theory of, [108];
formula for, [201];
Negative Collodion, theory of, [113];
formula for, [208];
Collodion for copying engravings, [231];
for keeping processes, [298];
for hot climates, [210];
for working by artificial light, [238];
to remove the brown colour from Collodion, [86].
Collodion film, the proper time for immersing it in the Bath, [219];
a thin film often good for direct Positives, [109];
a thicker film for Negatives, [113];
cause of the film falling away from the glass, [83], [293];
spots and markings on, [281];
conditions which affect its sensitiveness to light, [92];
causes influencing its behaviour with the developer, [98];
mode of preserving sensitiveness of film, [289].
Collodio-Albumen process, theory of, [181];
practical details of, [294].
Colours, their nature explained, [47];
their chemical action on sensitive film, [64];
their photographic action assisted by reflection of white light, [66].
Combination, laws of, [307].
Conjugate foci, explained, [52], [272].
Crookes, Mr., remarks upon chemical spectrum, [63];
upon waxed paper process, [180];
preservative process for Collodion films, [289].
Curvature of luminous image formed by lens, explained, [53].
Cyanide of Potassium, its fixing action explained, [44];
preparation of solution of, [207];
used to remove stains, [377].
Daguerreotype, its invention, [8];
theory of the process, [171].
Development of invisible image, explanation of, [34-40];
second, or intensifying stage explained, [37];
details of developing glass Positives and Negatives, [221-223];
development of paper Positives, [259];
conditions which increase or diminish rapidity of development, [98];
irregularities of development, [103].
Developers, their preparation and properties, [26];
comparative strength of, [98];
theory of, for Positives, [111];
for Negatives, [117];
formulæ for Positive developers, [205];
for Negative, [211].
Diagrams, mode of copying, [232].
Diaphragms for lenses. See [Stops].
Double decomposition, illustrated, [14];
explained, [314].
Dry Collodion process, [298].
Elementary bodies, table of, [306];
combination of, [307].
Engravings, mode of copying, [231];
often yield dark-coloured prints, [255].
Equivalent proportions, [320].
Ether, properties of, [339];
purification of, for Photography, [195];
must be kept in a dark place, [196];
should not be distilled from residues of old Collodion, [96].
Experiments, illustrating action of Light upon Chloride of Silver, [21];
illustrating formation and development of invisible images, [25];
illustrating photographic action of coloured light, [62].
Exposure in the Camera, rules for Positives, [221];
for Negatives, [225];
for preserved Collodion plates, [292];
for microscopic photographs, [238];
effects of under and over-exposing, [35];
exposure required in Calotype process, [177];
in waxed paper, [180];
in Albumen negative process, [181];
in dry Collodion process, [301];
in Taupenot's process, [297].
Fading of Positives, explained at length, [160];
Author's researches on, [153].
Film, sensitive. See [Collodion film].
Filters, mode of cutting, [376].
Fixing, theory of, [41];
of paper prints explained, [128];
solution for fixing glass Positives and Negatives, [212];
manipulatory details of fixing, [225];
fixing paper Positives with Ammonia, [271].
Fixing and toning Bath, its preparation, [250];
conditions which favour or retard its action, [135];
certain states of the Bath injurious to the proofs, [136];
importance of keeping it in an active condition, [168];
must not be employed immediately after mixing, [251];
must not be allowed to become acid by constant use, [168];
theory of the gradual change of properties it undergoes, [156].
Foci, actinic and luminous, [60];
actinic, mode of finding, [229];
variation between them in microscopic objectives, [237].
Focussing the object, [220].
Fogging, theory of, [103];
mode of detecting causes of, [276].
Formulæ for solutions required in Collodion process, [201];
for papers used in Positive printing, [241];
want of correspondence between, [257].
Gallic Acid, its preparation and properties, [27];
used in paper processes, [178];
becomes mouldy by keeping, [261].
formula for developing paper Positives with, [261].
Gallo-Nitrate of Silver, [177];
discolours rapidly when developing dishes are not clean, [179].
Gelatine, its properties, [341];
forms a compound with an Oxide of Silver, [21];
employed in dry Collodion process, [299];
modified form of, [302];
affects the colour in printing processes, [128];
used in Positive printing to form an even surface layer, [126];
as a cement to mount Photographs, [257].
Glass plates, rules for cleaning, [39];
details of cleaning, [213];
mode of coating with Collodion, [215];
with Albumen, [180].
Glutinous Collodion, explained, [83].
Glycyrrhizine, its nature, [342];
its action in Collodion, [114];
formula for solution of, [209].
Gold, Chloride of. See [Chloride of Gold].
Gold salts, their use in Photographic printing explained, [131];
in the Daguerreotype process, [175].
Gradation of tone, in Collodion Photographs, affected by the density of the film, [109], [113];
by use of Glycyrrhizine, [115].
Gradation of tone, in paper Positives, conditions affecting it in prints obtained by direct exposure, [123];
in Positives printed by development, [266].
Hadow, Mr., researches on Collodion, [77];
formula for making Pyroxyline, [187].
Heliography, invented by M. Niépce, [7].
Historical sketch of Photography, [6].
Honey keeping process, [289].
Hunt, Mr., introduces Protosalts of Iron in developing, [111].
Hypo Bath. See [Fixing and Toning Bath].
Hyposulphite of Silver, its peculiar changes in colour, [129];
the sweet compound which it forms with Hyposulphite of Soda, [44].
Hyposulphite of Soda, preparation and properties, [43];
theory of its fixing action, [43];
blackens Nitrate of Silver, [129];
causes a milkiness with acids, [137];
its decomposition by constant use in fixing, [138];
the salts it forms with Chloride of Gold, [133];
its conversion into sulphuretting Tetrathionate by Iodine and Perchloride of Iron, [139];
test for presence of, [169].
Iceland moss, its use in Positive printing, [128];
formula for preparing paper with, [245].
Imperfections in Collodion Negatives, [282];
in Positives, [284];
in paper Positives, [285].
Intensity, explanation of term, [92];
mode of increasing in Negatives, [99], 114;
effect of Acetate of Silver upon, [116];
of Nitrite of Silver upon, [102];
mode of diminishing, in glass Positives, [109], [110];
conditions affecting intensity in paper Positives, [123];
in developed paper Positives, [266].
Invisible images, theory of formation of, [34];
development of, [36];
experiments illustrating, [25].
Iodate, how formed in Collodion film, [94];
produces insensitiveness, [198].
Iodide of Ammonium, preparation of, [198];
not fitted for iodizing Collodion required to be kept long, [210].
Iodide of Iron, an accelerator to Collodion, [116].
Iodide of Potassium and Silver, properties of, [42];
mode of iodizing Calotype papers by, [177].
Iodide of Potassium, tests of purity of, [197];
extent of solubility in Alcohol, [351];
dissolves Iodide of Silver, [42].
Iodide of Silver, its preparation and properties, [16];
unaffected by direct action of light, [19];
highly sensitive to invisible image, [24];
hypothesis of formation of latent image on, [34];
possibility of its reduction by Pyrogallic Acid shown, [33];
excess of Nitrate of Silver essential to its blackening by developer, [36];
diagrams of chemical spectrum on, [61], [64];
fixing agents for, [42];
its solubility in the Nitrate Bath, [86];
retards the action of Hypo fixing and toning Bath, [136];
superior permanency of developed prints on, [167];
details of Negative printing process on, [263].
Iodine, in Collodion, diminishes sensitiveness, [94];
forms Nitric Acid and Iodate in the Bath, [94];
often useful in Positive Collodion, [110];
in Negative Collodion, if fogging occurs, [105];
mode of removing from Collodion, [86].
Iodized Collodion. See Collodion.
Kaolin, properties of, [335];
used to decolorize Nitrate Baths, [91];
importance of purifying it before use, [245].
Landscape Photography, with preserved Collodion plates, [288].
Latent image. See Invisible image.
Laws of substitution explained, [78].
Le Grey, M,, his toning process with Chloride of Gold, [132];
his waxed paper Negative process, [178].
Lenses, various forms of, [51];
foci of, [52];
formation of images by, [53];
use of stops, [58];
portrait, [59];
chemical foci of, [60];
chromatic aberration of, [54];
spherical aberration of, [56];
simple directions for using lenses, [227];
for finding chemical focus, [229].
Light; its action upon Silver Salts, [19];
experiments illustrating, [21];
formation of invisible images by, [24];
its alternating action upon Daguerreotype plate, [39];
its compound nature, [46];
photographic action of coloured light, [60];
refraction of light, [49].
Llewellyn, Mr., his Oxymel process, [291].
Manipulations of Collodion process, [213];
of Photographic printing, [251];
of toning by Sel d'or, [267].
Manuscripts, mode of copying, [231].
Markings on Collodion Pictures, [281].
Measures and Weights, [379].
Microscopic Photography, [235].
Moser, M. Ludwig, his researches on the development of invisible images, [37].
Mounting Positive Prints, substances which should be avoided in, [155], [164];
details of, [257].
Negative processes for printing Positives, [259], [263].
Negatives, definition of, [106];
Collodion Negatives, theory of production of, [113];
Calotype, [176];
waxed paper, [178];
Albumen, [180];
Collodio-Albumen (Taupenot), [181];
mode of developing Collodion Negatives, [37], [117], [223];
of converting Positives into, [117];
formula for solutions for Negatives, [208];
the Collodion best adapted for Negatives, [114];
spots and markings upon Negatives, [282];
decomposition of Pyroxyline a cause of fading of, [166].
Nitrate of Silver, preparation and properties of, [12];
preparation of from standard coin of realm, [362];
often contains free Nitric Acid, [13];
when very strongly fused, contains Nitrite (see Nitrite of Silver), [14];
not acted on by light, [18];
its reduction by Pyrogallic Acid explained, [31];
the melted Nitrate more certain in its action, [13], [101];
its presence essential in developing the image, [36], [98];
increases sensitiveness of Collodion plate, [92];
dissolves Iodide of Silver, [86];
discoloured by Albumen, [245], [329];
forms a compound with Honey, [289];
with various other organic bodies, [21];
very little acted on by Glycerine, [342];
mode of recovering the Silver from, [372].
Nitrate Bath, mode of preparing for glass Positives, [110], [203];
for Collodion Negatives, [116], [211];
its power of dissolving Iodide of Silver, its occasional acidity and alkalinity explained, [86];
the mode in which Acetate of Silver may be formed in it, [89];
a list of the substances by which it is decomposed, [90];
changes by use, [91];
effect of these changes on sensitiveness, [97];
on intensity, [102];
care required to prevent it from yielding foggy pictures, [104];
a caution against the too frequent addition of alkali, [204];
quantitative testing of the Bath, [371].
Nitrite of Silver, adds to rapidity of development, [102];
tends slightly to produce fogging, [104];
solarizes the high lights, [111].
Nitric Acid, its preparation and properties, [355];
its oxidizing powers, [12];
impairs sensitiveness of Collodion film, [93];
lessens rapidity of development, [98];
tends to prevent fogging, [104];
sometimes usefully employed for glass Positives, [110];
contra-indicated for Negatives, [116];
its accumulation in the Nitrate Bath explained, [94];
mode of removing it, [90];
cannot exist in contact with Acetate of Silver, [116];
produces stains on cloth, [215];
mode of determining the strength of Commercial Nitric Acid, [186];
table of strength of Nitric Acid of different densities, [378].
Nitro-Sulphuric Acid, explained, [77];
process for making by mixed acids, [186];
by Oil of Vitriol and Nitre, [190];
should not be used cold, [83].
Nomenclature, chemical, [315].
Norris, Dr., his dry Collodion process, [298].
Notation, chemical, [318].
Organic bodies, chemistry of, [324].
Oxide of Silver, preparation and properties, [17];
dissolves in the Nitrate Bath, rendering it alkaline, [88];
properties of its solution in Ammonia, [362];
preparation of ditto, [247];
its solution in Nitrate of Ammonia used in Photography, [249].
Oxymel, keeping process, [291];
preparation of Oxymel, [360].
Paper, Photographic, selection of, [240];
peculiarity of English papers, [241].
Paper, sensitive, for printing. See [Sensitive Paper].
Perchloride of Iron, preparation of toning Bath with, [160].
Permanence of Positives, mode of testing, [169].
Photographic image, chemical composition of, [140];
action of destructive tests on, [145].
Photographic properties of Salts of Silver, [18];
of Iodide of Silver upon Collodion, [74].
Photographic researches by the Author, [140].
Photography, historical sketch of, [6];
the term explained, [61].
Portrait lenses, theory of their construction, [59];
rules for their use, [227];
mode of finding chemical focus, [229].
Portraits, drapery for, [66];
directions for taking, [220];
the position of the Camera, and other points of importance, [228];
the time of exposure, [221].
Positive printing, on Albuminized paper, formulæ for, [241];
on plain paper, formulæ for, [245];
on Ammonio-Nitrate paper, formula for, [246], [258];
by development, formulæ for, [259];
manipulatory details of printing, fixing, toning, washing, and mounting, [251];
process of toning by Sel d'or, theory of, [134];
practice of, [267];
reasons for the want of correspondence between different formulæ, [257];
use of Chloride of Gold in toning, [132], [271];
theory of the preparation of the sensitive paper for Positives, [122];
theory of the process of fixing, [129];
of toning by Gold, [132];
the Author's researches, [140];
rationale of the printing process, [120];
composition of the image, [140];
fading of Positive prints, [160];
destructive action of Sulphur on, [145];
of oxidizing agents on, [148];
of Chlorine, acids, boiling water, etc., on, [151];
of combustion of coal-gas on, [153];
effect of damp air on, [153];
theory of mode of washing Positives, [162];
comparative permanency of prints, [166];
mode of testing permanency, [169].
Positives, definition of, [106];
Collodion Positives, theory of production of, [108];
formulæ for solutions for, [201];
development of, [111], [221];
Collodion and Nitrate Bath best adapted for, [109];
mode of whitening by Bichloride of Mercury, [112];
solution for whitening, [207];
mode of backing up, [226];
spots and markings on, [284];
mode of printing Positives on Collodion, [272].
Positives, enlarged, mode of printing, [272].
Practice of Collodion process, [183].
Preservative processes for Collodion plates, [289].
Printing, Photographic, theory of, [120];
practical details of, [240].
Prism, refraction of light by, [51];
diagram of formation of spectrum by, [47];
explained, [54].
Prismatic spectrum, [47], [61].
Protonitrate of Iron, preparation of, [206];
a feeble developer when free from excess of Sulphate of Iron, [98];
theory of its mode of action, and rules for its use, [112];
cannot be prepared in quantity by adding Nitrate of Potash to Sulphate of Iron, [314];
sometimes requires the addition of Nitrate of Silver, [206].
Protosulphate of Iron, its preparation and properties, [29];
its characteristics as a developer for Collodion Positives, [111];
not well adapted for developing Collodion Negatives, [117];
preparation of the solution for Positives, [205];
mode of applying it to the plate, [221];
to remove iron stains on glass, [215].
Pyrogallic Acid, its preparation and properties, [28];
solution for developing glass Positives, [205];
for Negatives, [211];
cannot be used without Acetic Acid, [105];
less adapted for developing paper pictures, [178];
requires addition of Nitric Acid when used for Positives, [111];
superior to Sulphate of Iron for developing Negatives, [117], [144];
mode of obviating the brown discoloration of developing solutions, [212].
Pyroxyline, its nature and properties, [75];
preparation of, by Mr. Hadow's formula, [186];
by a rule-of-thumb mixture of the acids, [188];
by the Oil of Vitriol and Nitre process, [190];
details of immersing, washing, and drying, [191];
the glutinous variety produced by cold acids, [83];
recapitulation of the effects of varying the strength of the acid mixture, [193];
spontaneous decomposition of Pyroxyline, [166].
Reduction of metallic oxides by developers, theory of, [26];
of Silver salts by developers, theory of, [30];
practical details of reducing Silver compounds to metallic state, [372].
Salts nature of, [310].
Salts of Silver, their preparation and properties, [12];
their Photographic action, [18];
theory of their reduction by developer, [30];
directions for obtaining metal from, [372].
Sel d'or, toning process by, its theory, [134];
its practical details, [267];
its advantages, [271];
gives permanent prints, [167].
Sensitiveness, term explained, [92];
conditions favourable to, [97].
Sensitiveness of Collodion film, causes influencing, [92];
superior sensitiveness partially explained, [74];
preservation of sensitive film, [288].
Sensitive paper, theory of preparation of, [22], [122];
its darkening by light described, [123];
preparation of Albuminized paper, [241];
of plain paper, [245];
of Ammonio-Nitrate paper, [246], [258];
of paper for Negative processes, [259];
causes which affect the sensitiveness of Positive paper, [123];
which alter the colour of the image, [126];
spots and markings on, [285];
a large excess of Nitrate of Silver essential, [124];
the paper should not be kept too long, [130], [286].
Serum of Milk, preparation of, [262], [355];
used in Negative printing process, [262].
Shadbolt, Mr., his Honey keeping process, [289];
employs artificial light in Micro-Photography, [237].
Silver, properties of, [362];
estimation of, in Nitrate Baths, [371];
recovery from waste solutions, [372];
reduction from Chloride, [374];
stains, removal of, [377].
Size, mode of removing, from paper Positives, [255].
Solar spectrum, [47], [61].
Soluble paper. See [Pyroxyline].
Specific gravity of liquids, mode of finding, [375].
Spherical aberration, [56].
Spirits of Wine, preparation and properties, [330];
not always sufficiently strong for Collodion, [84];
mode of rectifying, [196];
sometimes contaminated with, fusel oil, [96].
Spots on Collodion plates, [279];
on paper Positives, [285];
on prints obtained by development, [266];
on preserved Collodion plates, [293].
Stains, Silver, removal of, [377].
Stereoscope, invention of, [67];
theory of, [68];
Wheatstone's, [69];
Brewster's, [70].
Stereoscopic Photographs, rules for taking, [71];
practical details of, [232].
Stops, theory of use of, [57];
simple mode of making, [228];
position of the stop often important, [230].
Strength of acids, tables of, [378].
Subchloride of Silver, its preparation and properties, [15];
decomposed by fixing agents, [141].
Suboxide of Silver, its properties, [18];
forms compounds with organic matters. Citric Acid, Albumen, etc., [21].
Substitution, laws of, explained, [78].
Sulphate of Iron. See [Protosulphate of Iron].
Sulphate of Quinine, absorption of chemical rays by, [65].
Sulphuric Acid, table of strength of, [378].
Sutton, Mr., theory of Sel d'or toning process, [134];
practical details of, [267];
Negative printing process, [262];
preparation of Serum of Milk for, [355].
Symbols, use of, [318].
Syruped Collodion film, [289].
Talbot, Mr., his discoveries, [9];
theory of Calotype process, [176].
Taupenot, M., his Collodio-Albumen process, [181];
practical details of, [294].
Temperature, its effect upon development of Collodion film, [102];
upon fogging, [105];
upon keeping Collodion, [210];
upon action of fixing Bath for paper Positives, [130];
upon Hypo toning Bath, [136].
Test-papers, use of, [376].
Toning Bath for Positives, with Sel d'or, [134], [267];
with Hyposulphite and Gold, see [Fixing and Toning Bath];
with Chloride of Iron and Hyposulphite, [160].
Toning of Positives, term defined, [121];
may injure the stability of the proof, [154];
points to be kept in view to avoid fading, [167];
manipulatory details of, [253];
by Sel d'or, [267].
Transparencies, mode of printing, [273].
Varnishes for Collodion Photographs, [226].
View Lenses, directions for using, [230].
Vocabulary of Photographic chemicals, [327].
Washing Positive prints, rules for, [162];
details of, [255].
Waxed paper process, theory of, [178].
Weights and Measures, table of, [379].
PRINTED BY JOHN EDWARD TAYLOR, LITTLE QUEEN STREET, LINCOLN'S INN FIELDS.