I can tell you what I would not recommend... I had a large sheet of telescope flocking material (adhesive on the back). I thought that would make a good mask, especially for stray light bouncing around. It's a poor choice. First, it's not dense enough to block all the light. Second, and more important, the flocking material does come loose and thus creates another source of crap that lands on your negative and has to be removed during spotting.
The template I'm using is a thick piece of wood, so I just spray painted it matte black. That blocks all the light except what I want.
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