I just finished a series of experiments for a magazine article on cross-dyeing, and was startled to find that many colors of Cibacron F and Pro MX dyes will dye protein fibers in an alkaline environment! Photos of my experiments can be found here: http://www.tienchiu.com/2012/05/cross-dyed-dye-samples/
This renders them useless for cross-dyeing, of course.
Can you explain why this is happening, and suggest other dyes that might work for cross-dyeing? (Except for Alter Ego dyes - way too expensive for me!)