I recently read of a traditional technique for preparing a rubber, pad, or fad for French polishing, and this technique differs from others I have researched. I switched from cotton balls as a pad filler to raw washed wool, which I am very happy with how it works and lasts.
However this new method looked interesting, so I asked my favorite seamstress if she had some 100% woolen fabric that I could use? She brought by enough for my specifications, but wider, so I could rip it to the desired size. I thought that before I went ahead with French polishing, I should test the fabric to see if it would bleed any of the dye.
Sure enough after some alcohol and placed in a glass jar for an hour or so, then I took it out and placed it on a paper towel and you can see what happened.
I told the seamstress of the problem and she said she had some light brown herringbone wool fabric which she dropped off. I did the same test and no bleeding, so I will use this next time I polish.
I will also post the new/old technique soon and see how well it works.