An alternative spelling of eosin; a bright red synthetic dye used in microscopy and histology for staining cells and tissues.
Same origin as eosin, from Greek 'eos' (dawn/rosy light); the '-ine' ending is a common variant in chemistry for naming organic compounds and dyes.
The fact that 'eosin' and 'eosine' both exist shows how chemistry naming evolved—sometimes multiple spellings were used before standards were established, so you'll see both in old textbooks.
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