What is a good dye for dying wool/mohair yarn?

You can use anything that will dye a protein fibre. Are you over dyeing because you don’t like the colour? You will need to be careful because wool tends to felt if the temperature in the dye pot gets too hot. I imagine that mohair might have the same tendency.

I hand spun white kid mohair with 10% white wool. I will watch the temperature. Thanks for the warning.