Cyanotype recipe (2)

Single solution formula: 
More sensitive and stable mixture but only lasts 4 hours.
     1.25 grams Oxalic acid (TOXIC to even skin)
     33.7 grams Ferric Ammonium Citrate
     11.2 grams Potassium Ferricyanide
     0.25 grams Ammonium Dichromate
     250 ml distilled H₂0
Mix all together just before use.

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