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Hope the following helps
someone
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Concise Formula for Bichromated Wash
Drawing System
A. Sizing. Sugar 4 gms
Gelatine 4 gms
Water 100 ml.
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B. Pigment mix. Lamp black 1gm.
Gum 2.5 ml. ( 50% solution)
Water 2 ml.
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Take 2 gms of the above B pigment mix and add 3/4''
strip of Water colour tube paint.
Mix well and add this to 15 to 18 ml of the following
solution. Mix well.
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C. Base mix. Starch (Corn or Rice) 2 gms.
Sugar 2 gms.
Boiling Water 100 ml.
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Sensitizer solution by immersion.
Ammonium
Dichromate 1 gm.
Sodium or Potassium Citrate 1 gm.
Water
100 ml.
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Ultra Violet exposure decided by tests.
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Development soak 10 + minutes in Water 115
F
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Spray development. Return print to soak water, now
and then during clearing, to maintain temperature.
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As ever.............
John-
Photographist-London-UK
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