STUDIO AND WORKROOM 
Iodine 0.5 ¢ 
Potassium cyanide 0.03 g 
Water 1000 ccm 
15 
3.84 gr. 
0.25 gr. 
16 oz. 
Rub the cyanide up with the iodine, add first a very little 
water, and then make up to bulk. Or the following may be 
used: 
Thiocarbamide 15.5) 2 
Nitric acid | 15.5 ccm 
Water ; 1000 ccm 
Os: 
Potassium bichromate 8g 
Sulphuric acid 12 ccm 
Water 1000 ccm 
Then wash well. 
119 er. 
119 min. 
16 oz. 
62 gr. 
90 min. 
16 oz. 
NEGATIVES Direct.—This method may be used for direct 
or enlarged prints on paper or plates. The image should be 
developed with: 
Amidol 6.25 g 
Sodium sulphite, dry 15.6¢ 
Ammonium bromide 475¢ 
Potassium metabisulphite 2¢ 
Water 1000 ccm 
45 gr. 
 120/er. 
36 gr. 
15 gr. 
16 oz. 
Development should be stopped when the image is seen 
through at the back of the plate. Wash for 5 minutes, back 
with a piece of wet black paper, and expose to daylight for 
30 seconds or to 6 inches of magnesium ribbon held one foot 
from the plate. Bleach in: 
Potassium bichromate 29/316, 
Nitric acid 12 ccm 
Water 1000 ccm 
Then immerse in: 
Sodium sulphite, dry 95g 
Potassium metabisulphite 6.25 g 
225.80. 
90 min. 
16 oz. 
1¥4 oz. 
45 gr. 
