Different substances were distinguished by the name of "alumen"; but they were all characterized by a certain degree of astringency, and were all employed in dyeing and medicine, the light-coloured alumen being useful in brilliant dyes, the dark-coloured only in dyeing black or very dark colours. [Please select]
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The action of oxygen on the tannin also accounts for the loss of astringency on fermentation, and it may be well to point out that fermentation increases the internal surface of the bean exposed to air and oxygen. [Please select]
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You thus obtain a good supply of sprouts, as invaluable for opening qualities, as the old heather is to be dreaded for its astringency. [Please select]
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