While doing some restoration french polishing, I noticed something with my pads that I am at a loss to figure out. I am using 100% linen cloth with cheese cloth as the inner core. When I start out, it looks and works fine but if I stop and put the rubber in a plastic bag and come back to it later, it has little black spots all over the cloth and the cheese cloth. I thought the shellac might have some residue in it but I strained the solution and it still happens. I am going to try and attach a picture I took so you can see what I am seeing. Any help identifying this condition will be appreciated.
https://lh3.googleusercontent.com/-p1wkUq6utV8/Th5LmEdwL1I/AAAAAAAACK4/vw-KnigR-kM/s800/IMAG0156.jpg
It kinda looks like mold of some sort because what you see in the picture is minor to what I have seen????????
https://lh3.googleusercontent.com/-p1wkUq6utV8/Th5LmEdwL1I/AAAAAAAACK4/vw-KnigR-kM/s800/IMAG0156.jpg
It kinda looks like mold of some sort because what you see in the picture is minor to what I have seen????????