[fortean]

I think it's cotton. May have polyester in it too. Curtain lining material, thin, cream colour and not stretchy. The mask is lined black velvet. I was thinking about using pond liner for the false back. I may still try it.

Whatever material you use be sure to iron it (if it's not pond liner) and not allow it to crease when you fix it to your screen. I got creases in the screen fabric first time. It is a thin screen fabric though. Having said that the only time I could see the creases was when the screen was illuminated from the side.

One more thing. Don't iron it on the dinning room table. It took me longer to re-polish the table than make the mask. Thankfully my wife was out when I did it.