Any questions in regard to photograph matters will be willingly answered by the Editor of this column, and we should be glad to hear from any of our club who can make helpful suggestions.
FORMULAS FOR COLORING TRANSPARENCIES.
As we have received many inquiries in regard to the colors used in making the tinted transparencies described in No. 857 of the Round Table, we give the following formulas for preparing the coloring solutions, which are by M. Gachinot, Paris, France, all of which can be successfully used. Having printed the plate according to the directions given, immerse in any of the following solutions till the desired color or tint is obtained:
RED BATH.
| Carmine (in grains) | 5 | parts. |
| Liquid Ammonia | 15 | " |
| Distilled Water | 120 | " |
BLUE BATH.
| Prussian Blue | 50 | parts. |
| Oxalic Acid | 50 | " |
| Distilled Water | 120 | " |