I would like to make a set of dark slides of various ratios, such as 1:2, 3:4, etc.
One option is to cut up an existing dark slide - but that can be a waste of a good dark slide.
If I wanted to get some material that is rigid, opaque, and of the appropriate thickness - and which I could cut to shape with a simple blade - what would I buy, and where could I get it ?
The final items don't have to have nice handles and locks. As long as they can inserted and removed, they are good enough.
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