I have copied this from my post in the Wilderness Trapping section:
I would like to add some constructive criticism here if I may.
Over the years I have made it a point to question the relevant people in the fur industry relative to fur handling. This includes trappers, fur graders, tanners, furriers, and brokers (buyers). Having worked with career fur graders as well as pre-grading and some grading myself I think I have a good understanding of pelt handling. Not to mention the numerous (1000's) of fur bearers I have put up myself.
It is fine to wash your furs with a mild soap but they should never be then placed on the drying form fur side out. Nor should furs for the fur market be treated with salt, borax. or any other chemical which may pre tans the leather. Except for perhaps the ears,lips or paws. The exception being animals for taxidermy purposes.
Ranch fur foxes are put on boards fur out. They use special boards with grooving cut up the sides and on the flat of the boards. They then have air tubes hooked to each board to ensure proper drying. There is a good chance of the sides becoming tainted and hair slip in the tanning process where trapper furs are boarded only fur out.
All fur should be boarded leather out then turned after proper drying and placed back on the board for a few days. Except furs that are handled fur in of course.
In my 10 years of working in with NAFA (then Dominion Soudack /HBC/Trappers International) I had opportunity to chat with many many fur brokers and tanners about fur handling. They really frown on the use of salt or borax on furs used for fur manufacturing as it will sometimes produce a different tanned product from their formulas. They want uniformity in each batch.
I am only passing this on from what I have learned and been told over the years and not trying to put any ones methods down.