Hi, I searched several sources, it's very difficult to get an idea about which light tight dark cloth to use for bellow building. Some sources state Porter's thinner dark cloth, but Porter doesn't propose it anymore for sale. I would *love* to know which fabric (and wherefrom) professionnal bellow builders use for their different bellow layers.
Biggest problem is light tightness and very small thickness....

thank's for your info

Torsten