Dying Deer Tan

[TomG]

I have a piece of what I think is deer tan.

I've tried to do some test dying with Fiebings Oil Dye and have mixed results with the colors. Green and Purple look OK. the red and 2 blues I used are weak.

First question -is Deer Tan cow dyable or like Chrome Tanned?

If oil dye is OK, what finish is best to keep it soft, yet prevent dye ruboff?

Thanks