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Hypo (sodium thiosulfate)
480 grams
Water to make
2 liters
Then add the following hardner solution slowly to the cool hypo solution while stirring the latter rapidly.
Water
160 ml
Sodium Sulfite
30 grams
Acetic Acid (28%)
96 ml
Powdered Potassium Alum
Dissolve in the order given.
(c) 1968-today John E. Simmons