The Gum-Bichromate Process 
PIGMENTS FOR GuM-BicHROMATE (Kosel).—Powder or 
tempera colours should be used. 
Warm brown: Bone black, 5 parts; Vandyke brown, 3 
parts; ivory black, 2 parts; Indian red, 1 part. 
Purple brown: Ivory black, 5 parts; Vandyke brown, 4 
parts; dark alizarin lake, 2 parts; Indian red, 1 part. 
Yellowish brown: Ivory black, 5 parts; bone black, 5 
parts; burnt sienna, 1 part. 
Dark brown: Bone or ivory black alone. 
Brown (for sunset effects): Bistre. 
Brown, medium shade: Bone black, 5 parts; Vandyke © 
brown, 4 parts; burnt sienna, 1 part; Indian red, 1 part. 
Bright brown: Bone black, 5 parts; Vandyke brown, 4 
parts; sienna, 4 parts. 
Deep brown: Ivory black, 5 parts; Vandyke brown, 3 
parts; Indian red, 1 part. 
Bide.) Ivory or peach black, 5)\\patts ;) mdigo) 5) parts: 
fats blue; 1) part. 
Dark green; Bone) black; 5 parts; Paris blue, 2 parts: 
Or) Bone) black; 5 parts; indigo,):5) parts; blue ‘black, (5 
parts; Paris blue, 1 part; cadmium yellow, 1 part. 
Bright green: Vandyke brown, 3 parts, Paris blue, 1 part. 
Olive green: Sienna, 2 parts; indigo, 2 parts; bone black, 
5 parts. 
Red: Ivory black, 5 parts; burnt sienna, 2 parts; Indian 
red, 2 parts. 
Warm red: Bone black, 5 parts; red chalk, 3 parts; 
Indian red, 1 part. 
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