Hi, I'm new here. I used to do natural dyes but my current project is making a lap rug from cashmere sweaters. I have the luck to live near a "Goodwill by the pound store." For those unfamiliar with them: they're Goodwill Thrift stores that have enormous bins of goods. You dig and rummage thru the bins and pay for what you want at a specific price per pound. I think the current price for fabric/leather goods is $1.29. I stop by frequently to rummage for half an hour or so.
After nearly a year I now have plenty of moth-eaten or shrunken pure cashmere sweaters. Although I have a few cabled sweaters the majority are plain and various shades of "natural" - a beige-y, oatmeal color. One is pastel pink, one a very vivid aqua.
At last, my question is: Can I dye these sweaters using Procion dyes I already have on hand? I've read that substituting vinegar for soda ash will make the dye work well. Is this true? What quantity of vinegar?
I have already washed all of these sweaters on the "heavy" cycle and dried them on hot until they were toasty. (Did you know cashmere doesn't really felt?) I know that sometime in its life my lap-blanket will end up going thru the laundry with bluejeans or towels and I don't want any surprises. This means I can use any dye process at all as long as the result will be color fast.
I want to end up with black, natural and red (the color of maple leaves in the fall).
Any advice or suggestions or questions welcomed!