I had a customer bring in a Black Bear rug that was done in 1968. His Grandfather shot it in 1968 and it was the third largest bear on record in WI. I am concerned that if I try and rehydrate it that I might reactivate acids in the original tan that could damage the hide. My gut is telling me to turn it away but if it can be done I would like to give it a try. Any suggestions or things I am not thinking of? Thanks in advance.