A lichen, particularly Lecanora atra or related species, used in traditional dyeing to produce brown, red, and purple colors.
From Gaelic and Scottish origins, related to 'crottal.' This variant spelling is commonly used in Scottish and Irish textile traditions.
Crottle-dyed tweeds are still treasured by weavers today because the colors have a depth and permanence that modern synthetic dyes struggle to match—nature's chemistry beats the lab!
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