PRINTING-OUT PAPERS 181 
Water | 1000 ccm 20 oz. 
Bathe for 5 minutes, and then fix in 10 per cent solution of 
hypo. 
Namias.— 
Platinum perchloride LU Mes 8.5 gr. 
Stannous chloride lg FUT as 
Water 50 ccm 1 oz. 
Dissolve the platinum in half the water, the tin salt in the 
remainder, and mix the two solutions; then add: 
Hydrochloric acid 5 ccm 384 min. 
Oxalic acid 10g 77 gr. 
Water to 1000 ccm 16 oz. 
The prints should be washed in salt and water, and then in 
plain water before toning. 
CoMBINED PLATINUM AND GoLp Toninc.—The use of 
gold and platinum gives pure black or blue-black tones, the 
blue tinge being dependent on the depth of toning with the 
gold. Print deeply, and immerse the print in: 
Salt 252 192 gr. 
Sodium carbonate, dry 72S) 25 19 gr. 
Water 1000 ccm 16 oz. 
Leave for 5 minutes, wash well, and tone in: 
Borax 10g 77 gr. 
Sodium acetate, fused 10g 77 gr. 
Gold chloride 0.5¢ 3.8 gr. 
Water 1000 ccm 16 oz. 
Then wash, and tone in: 
Potassium chloroplatinite 0.7 ¢g 5.4 gr. 
Citric acid 10g 77 gr. 
Salt l6g 123 gr. 
Water 1000 ccm 16 oz. 
Tone until the prints look purple-black; then wash, and fix. 
