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Description
Gallnut is used as a tannin for pre-mordanting cellulose (plant) fibres such as cotton. Made from tannin rich galls which form on trees as a natural defence mechanism against insects. The galls resemble nuts, in that they are hard and generally round, but are not truly a nut.
Used as a pre-mordant for cellulose fibres at 6-8% wof, the...