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Nylon/polyester in the thread causes it to melt instead of burn. Phosphors used in modern detergents and dyes cause a bright glow under black light. An interesting note, if you launder your period cloth items using most modern detergents, especially ones that advertise "brighter colors and whiter whites", they will glow under black light. You can still find a few "natural" detergents that do not contain phosphors. Check the ingredients list on the label before using them. You can search the web for any you are unsure of