Definitions
from The Century Dictionary.
- Pertaining to catechu and tannin.
Etymologies
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Examples
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It is by the action of tannin (gallotannic acid) on the ferric oxides thus formed that the black is produced, and by that of catechu-tannic acid contained in the extract of catechu that one obtains a dark green, almost black color.
Photographic Reproduction Processes Peter C. Duchochois
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