Chloride of nickel and potassium ferrocyanate produce a fine brown.
Lime water and alizarine dissolved in alcohol dye violet.
Alizarine and the caustic alkalies produce a variety of tints, from violet to purple, according to the concentration of the solutions.
Lead acetate and alizarine in ammoniacal solution dye purple.
Potassium ferrocyanide and uranium nitrate produce a warm sepia tone. With chloride of nickel the tone is brown.
Ammoniacal solution of coralline diluted with water gives carmine red.
Potassium bichromate and extract of indigo produce a fine greenish tone suitable for landscapes.
Extract of indigo colors blue[35]
Some of these reactions can be applied to the printing processes with the bichromates, etc. The paper should be coated with galatine. See the Appendix.
Other colorations can be obtained with dyes in utilizing (as shown by Persoz) chromous chromic oxide as a mordant: alizarine, Brazil and yellow wood (morus tinctoria), [pg 106] Fustet (rhus cotinus), etc. The extent of this work does not admit of describing the numerous processes which can be employed; they will suggest themselves to the chemist.