Instead of eggs - why not try mixing Kerosene and Baking Soda and rubbing it into the flesh side? About 15 years ago I had a woman tell me it works great on sheepskins. However, it was a pure "stuffing" process and I doubt it had any fiber fixation and permenent stabilizing effect on the skin. It may have "appeared" tanned - but truly wasnt. Since I also noticed no Tanneries picking up on her unusual tan, and never heard any more feedback from her, I guess I have to assume it didnt catch on in the industry. Unfortunately the only advice I could give her was "don't get it wet"! One quick note about eggs though - the whites were used by the old time fur dressers to add a "glaze" the furs. I'm not familiar with how they were used in the process but it was commonly known.