MANGROVE BARK - The extract from mangrove bark is used to extensively in the tanning industry. Water damage affects the bark as the tannin content is decreased. Mangrove is grown in seawater swamps and would give a salt reaction to an analytical test. Bags may be strained due to natural sweat or the moisture content of the bark at the time of packing. If the bags are contaminated by complete or partial immersion they become strained dark red up to the bag ears, a phenomenon which could not be produced had the straining been due to natural moisture content of the bark.
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