An archaic or historical term for a type of adhesive substance or colloidal preparation; possibly a variant or obsolete name for collodion or similar materials.
Origin uncertain; possibly from colloid or coll- (adhesive) + -thun, or a variant of historical chemical nomenclature. This appears to be an extremely rare or possibly obsolete term with unclear etymology.
Collothun is basically a word archaeology—it shows up in old chemical texts but its precise meaning and origin have been lost to time. It's a reminder that hundreds of technical terms from previous centuries have simply vanished because chemistry standardized its language.
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