While we are on the topic - has any one experienced freezer burn on a hide that was detrimental?  Also, I got about 6 pronghorn hides to soak, flesh, diehair, and  brain tan, but I lost my round tuit!  Hope I can find it soon!  Got to get another barrel to soak the hides, though.  I use garden lime as my lye source, seems to be milder, washes out better, and then throw them into a front loading commercial washing machine with the old running shoes.  2 cycles throughout the tumbler and they are ready for the braining, and almost pre staked!  
Hawkdancer