[CHAPTER XIX.]
PRINTING ON RESINIZED PAPER.
The following is taken from another volume of this series.[27]
To Mr. Henry Cooper we are indebted for a valuable printing process, founded on substituting resins for albumen or other sizing matter. The prints obtained by this process are very beautiful, and lack that gloss of albumen which is often called vulgar and inartistic.
The following are the two formulæ which Mr. Cooper has communicated to the writer:—
| Frankincense | 10 | grains | ||
| Mastic | 8 | " | ||
| Calcium chloride | 5 | to | 10 | " |
| Alcohol | 1 | ounce | ||
When the resins are dissolved in the alcohol, the paper is immersed in the solution, then dried and rolled. The sensitizing bath recommended is as follows (though the strong bath given at [page 126] will answer):—
| Silver nitrate | 60 | grains |
| Water | 1 | ounce |
To the water is added as much gelatine as it will bear without gelatinizing at 60° Fah.
The second formula gives very beautiful prints, soft and delicate in gradation.
The paper is first coated with an emulsion of white lac in gelatine, which is prepared as follows:—