Cotton Rabbitry

I use Producers Pride and am wondering if anyone else might be seeing problems with it. I lost a grow out today and have no clue what...

I got my Alum on Amazon.com And here is a great Video on tanning with it , it is what I use on my hides.

Thank you Alaska Satain. They do have the Vienna markings as their mother is at least 1/2 Dutch. Momma also has two-tone eyes 1/2 blue...

Does anyone know what this coloring is called, I tend to have frosted-looking blacks often.