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Tannin Mordant Extracted from Oak Galls
Oak galls are rich in tannin (gallotannic acid). Tannin is a common mordant for cotton and linen: the fibre is tanned first, then metal mordants and dyes bind to it. Crush the galls, steep them in hot water, strain, and dry the liquid down to a brown powder.
The picture: young marble galls on an oak.
Beginner
Two days
Instructions
1
1
Crush the galls
Crush the galls
Weigh the dry galls and pound them to a coarse powder in the mortar.
Materials for this step:
Oak Galls200 gTools needed:
Balance Scale
Mortar and Pestle2
2
Steep hot
Steep hot
Cover the powder with water in a pot and keep it hot, not boiling, for an hour or two. Leave it overnight.
Materials for this step:
Water2 litersTools needed:
Large Cooking Pot3
3
Strain
Strain
Strain the brown liquid through cloth and squeeze the residue. Steep the residue once more and add that liquid.
Materials for this step:
Water1 literTools needed:
CheeseclothLarge Cooking Pot4
4
Dry to powder
Dry to powder
Boil the liquid down, then finish drying it in a shallow dish on the sand bath. Scrape it off, grind it fine and keep it in a closed jar.
Tools needed:
Large Cooking Pot
Evaporating Dish
Sand BathMortar and Pestle
Glass Jar5
5
Yield
Yield
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