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to produce a spongy leather of poor wearing quality. because of these characteristics, myrabolans is usually blended with other more astringent tannins, e.g., wattle, quebracho, or mangrove, which penetrate faster. myrabolans is a pyrogallol class of tannin, with low viscosity, a medium ph ( ) and salts
. quite often the "tannin" derived from a plant material. e.g., oak bark, has characteristics of both groups and consequently is generally considered to be a mixture or compound of the two principal types. the two classes of tannin also display different reactions towards acqueous solution of iron salts...
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