Ok here's a question that might have some bearing on this topic.
Can lets say OD green ammo pouch be bleached and then dyed the chosen color?
I think it would be okay for bags/jackets/etc., but not for anything load-bearing. The bleaching process may weaken the fibres of the material, so be careful. I suppose it's the same warning about putting stickers on, or painting, a motorcycle helmet- you have to know for sure that the stuff won't react with the helmet material and weaken it.
A