The print on Eastman’s bromide paper is prepared as follows:—
Red light must be used. It should be printed by an ordinary gas flame at a distance of about 50–80 cm. (= 24 to 36 ins.) for 1 to 20 seconds, according to the density of the negative. Here again a technically perfect print need not be arrived at, but one which contains all the details very clear. Under a good transparent negative a useful image for the artist will be obtained with about two seconds’ exposure.
The developer is composed of two solutions:—
| (A.) Water | 500 | g. |
| Neutral oxalate of potash | 165 | g. |
| (B.) Water | 50 | cm. |
| Sulphate of iron | 15 | cm. |
| Concentrated sulphuric acid | 2 | drops |
| Or glacial acetic acid | 5 | drops |
Three parts of solution A and one part of solution B should be {86} mixed together. As soon as the shadows have attained the desired tone, the prints should be placed in several fresh baths of
| Water | 200 | ccm. |
| Acetic acid | 1 | drachm. |
| Sat. sol. alum | 50 | g. |
and then washed and fixed in a bath of
| Water | 50 | ccm. |
| Sodium hyposulphite | 10 | g. |
for about ten minutes. Then well washed and dried.
For pen drawings all not gelatinized or albumenized printing papers may be used as already mentioned. The chief thing is that the paper should be well-sized and of good firm texture. If prepared grain paper is used, which is provided with a film of chalk, kaolin, or any other white colouring matter combined with gelatine, and on which film the grain is impressed, only prussiate prints can be used. The paper is sensitized as previously described, only it is advisable not to leave it too long in the solutions, or else the film may become softened. The film will also dissolve in hot water at about 80° C.