TONING 461 



should be treated in the following solution until the desired intensitj' of tone has been 

 reached. 



Engraving Black Solution 



Water 1000 cc. 32 oz. 



Hypo 20 g. ?i oz. 



Lead acetate 5 g. 80 gr. 



The action of this solution proceeds rather slowly and for a normal change in 

 tone J-^ to 1 hr. is required. 



Red Tones from Sulphide-toned Print. — Silver sulphide images may be readily 

 changed to brilliant and charming red tones by treatment with a gold chloride ammo- 

 nium sulphocyanate bath. The prints, which have already been toned by one of the 

 sulphide processes, are immersed in the following bath imtil the tone has changed to 

 red. They are then fixed for several minutes in the regular acid fixing bath and 

 washed and dried in the usual manner. 

 Tone directly in: 



Water 500 cc. 10 oz. 



Ammonium thiocyaiiate 50 g. l^i oz. 



1 per cent gold chloride 30 cc. 1 oz. 



With the above solution verj^ deep-blue tones may be obtained by using ordinary 

 l)lack-and-white prints. The prints should be made in the ordinary manner, fixed 

 and washed thoroughlj^ and then toned in the above solution. After toning thej' 

 should be fixed again for several minutes, washed and dried. 



Sepia Tones on Bromide Papers. — The fact has been emphasized that bromide 

 papers, as a class, do not tone so well as chlorobromide or chloride paper. There is a 

 formula, however, which will produce tones from cold brown through red-brown on 

 bromide papers. 



The thoroughly washed black-and-white print is first bleached and then redevel- 

 oped, the tone being controlled by the amount of sodium carbonate added to the 

 redeveloping solution. The table following the formula will give the amounts neces- 

 sary for certain tones. Here, again, not all papers will react the same, but by increas- 

 ing or decreasing the amount of the sodium carbonate, the desired tone may be 

 achieved. The formula without any sodium carbonate will produce brilliant red 

 tones. By increasing this carbonate in the redeveloping solution, we may achieve 

 many different shades of red-brown, sepia, and cold brown. Only two additions of 

 carbonate are given in the table, but experimentation will yield the desired tones on 

 any bromide paper. 



Bleach the well-washed print in the following solution: 



Potassium ferricyanide (10 per cent) ' 500 cc. 16 oz. 



Potassium bromide (10 per cent) 100 cc. 3 oz. 



Sodium carbonate (10 per cent) 200 cc. 6 oz. 



Water 200 cc. 6 oz. 



Wash and tone in the following solution: 



Sodium sulphantimoniate (Schlippes salt) 10 g. 3-4 oz., 45 gr. 



Sodium carbonate solution (10 per cent) 30 cc. 1 oz. 



Potassium bromide solution (10 per cent) 160 cc. 53-2 oz. 



Water 810 cc. 26 oz. 



Warm brown tones Add 30 cc. 10 per cent solution sodium carbonate 



Sepia tones Add 100 cc. 10 per cent solution sodium carbonate 



For colder tones increase the carbonate 30 cc. at a time until the desired tone is 

 reached. 



