TONING BROMIDE PRINTS 231 
According to Mimosa, if the selenium bath be neutralised 
with boric acid, there is no precipitation of the selenium; the 
addition of ammonia reduces the staining of the whites, which 
may be removed by a 10 per cent solution of potassium 
metabisulphite. 
Namias recommends to fuse in a nickel or iron crucible 
2 parts of granular selenium with 10 to 15 parts of caustic 
soda, and, when cold, dissolve in 100 parts of water. The 
toning bath is: 
Sodium selenide, thus made 100 ccm 768 min. 
Sodium sulphide 50 g 384 gr. 
Water 1000 ccm 16 oz. 
Bleach the prints in the usual way, and then tone in this 
solution. A combined toning and fixing bath may be pre- 
pared by mixing: 
Hypo 66g 500 gr. 
Sodium selenide,as above afew drops afew drops 
Water 1000 ccm 16 oz. 
Boric acid 40g 307 gr. 
Dissolve the hypo and the acid in hot water, and add the 
selenium solution when cold. Better sepia tones are obtained 
with the following: 
Powdered selenium 2 parts 
i Sodium sulphide 50 parts 
Fuse together and dissolve in 150 parts of water. To make 
the bath, add a few drops of this stock solution to a 2 per cent 
solution of sodium sulphide. All selenium salts have an 
intense garlic odor, which is very lasting. 
Motyspenum Toninc (Namias)—This gives a deep blue 
tone: 
Molybdic acid 100 g 2 02. 
Ammonia 250 ccm 5 oz. 
Water 250 ccm 5 oz. 
