The Carbon Process 
MAKING THE TissuE.—The gelatine mass is prepared with 
hard and soft gelatine in the ratio of 3:1, or the finest pale 
carpenter’s glue may be used, with an admixture of sugar 
candy ; in very hot dry climates a little glycerine. The latter 
addition is not advisable under ordinary circumstances. A 
typical formula is: 
Gelatine 200 g 3Y4 oz. 
Sugar candy 50 g 384 gr. 
Water 1000 ccm 16 oz. 
Colouring pigment Ato lOie |  30/to 77 Sr. 
Soak the gelatine and candy in the water for about 30 minutes 
and melt on a water bath. The pigment should be the finest 
powder colours, as used by artists. It should be worked up 
with a muller on a sheet of glass with a little of the gelatine 
solution, and added to the remainder of the solution, well 
stirred and strained through linen. 
THE Cotours.—The colours can be mixed in various pro- 
portions, so that any shade may be obtained, and these should 
be judged by their appearance when mixed with a little of the 
gelatine solution and dried. 
Chocolate brown —lIndian ink 6, English red 4, alizarin 1, 
dissolved in a little soda solution, purpurine 1 part. 
Engraving black —Lamp black 19, carmine lake 10, indigo 
10 parts. 
Warm black.—Lamp black 6, carmine lake 6, burnt umber 
4, indigo 2 parts. 
Dark brown.—Indigo 214, Indian red 6, carmine 114, Van- 
dyke brown 4, lamp black 30 parts. 
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