Thank you very much for your inquiry. Crocus cloth is an iron abrasive cloth, used as a polishing agent. It is similar to sandpaper but much finer. You should be able to find it in painting/sandpaper area of any major hardware store.
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Please note: The Corning Museum of Glass is a non-profit, educational institute and, as such, cannot answer questions about rarity or value of your glass. For more information about appraisal services, see our curatorial FAQs.