Bookmark this comparison chart at the link below.
Here’s a useful tool for choosing black masking whether you’re interested in a sewn curtain or just draping material. The fabrics below are ranked in descending order of price and described in terms of opacity, blackness, weight, width and use. Some of these fabrics are also rated for acoustic properties so click through to their product pages, and view the "Technical Info" tab on those pages to see more. Keep this chart handy for the next time you need masking by bookmarking this link. Rose Brand makes it easy.