Boracic lint
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Boracic lint was a type of medical dressing made from surgical lint that was soaked in a hot, saturated solution of boracic acid and glycerine and then left to dry.
It has been in use since at least the 19th century[1], but is now less commonly used.
The term boracic lint, or often just "boracic", pronounced "brassic", is also used as Cockney rhyming slang for having no money. Boracic lint -> skint.