The feathers tying with picric aren`t a problem. To preven alergic reaction is convenient that you clean your hands after the use with water and soap. The problem is with the acid picric when it is in very haigh concentration or cristal. I bought it at the pharmacy.
to wash your hands after handling something that could cause problems if ingested. The reason you get the color change is that the picric acid has bonded with materials in the feather or hair, so not much of it should come off after it has been dyed, washed and dried.
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