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Black Hair Dye without Silver

Pyrogallic acid…………....…………......      3.5 parts
Citric acid…………………..……………..      0.3 parts
Boro-glycerine……………..……………..       11 parts
Water……………………….……………..     100 parts

If the dye does not impart the desired intensity of color, the amount of Pyrogallic acid may be increased. The wash
 is applied evenings, followed in the morning by a weak ammonia cal wash.