Flyfshr, I also had the same idea as you and I got mylself a large amount pure tussah silk and ended up having the exact same problem as you. No matter what I tried the dye just would not fix. I used Veniards and another similiar dye. You may want to try Rit dye as it is recomended for silk along with other fibers. I have not tried to dye silk with Rit yet but I am planning on it.

Later, Jim