I bought some of this stuff call Color Magnet. It comes in a jar and pen form.
I decided to try it out by stamping it but the stuff is like slime or snot and not easy to get to stick to a stamp. I should have bought the pen which has a foam end for applying the product. When I saw stamping was not going to work I decided I would free style it and brush on some stripes. I let the product dry and on Sunday we threw it into one of the dye pots and this is the result.
Another technique I showed was putting the dye powder on wet soda ash soaked fabric. This first piece I scrunched the piece - a pinky coral color - and sprinkled on burnt orange. To me it looks like the fabric is rusted.