It is used in tannages of skins when full, firm and compact leathers are required. It is especially fit for tannage of sole leather. The leather becomes waterproof and resistant to the impact of light. Natural chestnut extract KPN is in the gruip of pyrogallolizable(hydrolizable) tannins. The active ingredients are mainly glycosides castalagin and vescalagin. KPN is the most important type of astringent tannin. It is an aromatized dust of light brown color.
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