TONING BROMIDE PRINTS Zo 
than to obtain warm tones; and greenish or rusty prints can 
be improved by placing them face up, as they come from the 
washing after fixing, on a sheet of glass, dabbing into flatness 
with a clean pad of linen, and brushing over with: 
Ammonium sulphocyanide 20 g 154 gr. 
Gold chloride lg ETN op 
Hot water 1000 ccm 16 oz. 
Use when cold. A soft flat brush, without metal binding, 
should be used. When the desired improvement is reached, 
that is, when the image becomes black or blue-black, wash 
well, and dry. Purple blacks can be obtained by bleaching 
the prints first in: 
Cupric sulphate TIS) 2s 192 gr. 
Potassium bromide 25) = 192 er. 
Water 1000 ccm 16 oz. 
Rinse, and immerse for 5 minutes in 5 per cent nitric acid, 
wash, and tone in: 
Ammonium sulphocyanide 8g 61 gr. 
Ammonia 3 ccm 23 min. 
Gold chloride VAS) |e 18 gr. 
Water 1000 ccm 16 oz. 
Toning takes from 10 to 20 minutes, and the more ammonia 
used, the deeper the tone. 
Platinum toning gives warm sepias, but the results are not 
permanent. The following may be used (Heatherly) : 
Potassium oxalate 160 ¢ 1228 gr. 
Mercuric chloride l3 g 100 gr. 
Potassium citrate 20 ¢ 154 gr. 
Citric acid A0 a hihne SOstor: 
Water 1000 ccm 16 oz. 
Mix, and add just before use: 
Potassium chloroplatinite 2s. 2O7 on: 
Hydrochloric acid 27, ccm 21 min. 
