I'm looking to do some simple tests for HCN in fruits. I'll put the sample in small vials and suspend a bit of Feigl-Anger paper above it to detect the HCN. My strips are very old, and I can't find a source to buy strips ready-made. Does anyone have some Feigl-Anger paper that I could have that I can cut into ca. 120 strips (they can be small, say 1 X 10 mm)?