I have a customer who has a bear hide that is 5 years old. He said it was commercially dry tanned but I don't know by who. He has kept it in a bag for 5 years. Now he finally decided to get a lifesize mount done with it. I told him it is not good to keep your dry tans so long and there is a possibility it is no good. As I never dealt with this situation, I was being a parrot and just repeating what I have read and been told about keeping tanned skins so long. I said we could try to rehydrate a part of the hide (maybe the head) and see what happens. I say the head cuz, if all is well, I could detail flesh it right away. Good idea or not? My question is what should I look for to decide if it is bad? IE. Hair slipping, weakness in the leather or what? What actually happens to a hide when it is no good? What would be a good way to see if it is still OK to use and how should I go about trying to get this done for him? Any help will be appreciated. I'd like to be able to do it for him as it is a bear that weighed over 450lbs. Why he waited this long to mount it is beyond me, but that is his business.