You shouldn't even need a box. If I angle the cloth covered board just right by the window (indirect light) I can get a near perfect black quite often. I don't use velvet, (I found a thick, sort of fuzzy, cotton cloth) so don't kow how much cloth type affects it. I also fiddle with the 'exposure compensation' on my camera being taking the pic, it usually helps a lot as well.
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Camille
Completely orchid obsessed and loving every minute of it....
My Orchid Photos
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