I'm trying to find a non-toxic pigment/ dye to paint designs on veg tanned leather and suede for making baby moccasins. I know "natural" is not always least toxic but it's a place to start. I've spoken to dharma trading and they recommended trying this non toxic pigment dye, even though it is meant for fabric not leather. http://www.dharmatrading.com/dyes/dharma-pigment-dye.html I have these romantic notions of watercolouring the leather using reduced indigo but I don't know how practical that