I've never used black plexi, but I know people who have (including Quinn, who likes the result a lot) and it seems to work well. But compared to almost all other media, its VERY expensive. I asked my local supplier to quote a price per 8x10 piece, and if I remember correctly, it was about $2.80 per 8x10. When I can make glass plates at $1.00 per piece, plexi seems rather expensive.
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