Oops sorry I wasn't clear, you could do up to about 9 or 10 silks 35"sq with 1/2oz of their acid dye. So doing 4 silks you'll use half a jar. Their normal kind of silk, Habatoi I think it's spelled, is perfect for these, 5oz weight.
Yes the acid dye is the pigment, I was saying if you'd like to try natural instead you can use turmeric, coffee, water you soaked black beans in, lots of different things, rather than the chemical kind, just need to add some vinegar and simmer a few minutes, exactly the same process as with their dye. I'm afraid I don't have measurements for alternative pigments, but I found I got great color by adding enough so the water starts to look opaque. What color(s) would you like to do?