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Tannin Mordant Extracted from Oak Galls
Dr Mary Gillham Archive Project · CC BY 2.0
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Charlie

14. Ukwakira 2026DE
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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.
Utangiye
Two days

Amabwiriza

1

Crush the galls

Weigh the dry galls and pound them to a coarse powder in the mortar.

Ibikoresho by'iyi ntambwe:

Utubyimba tw'umwaloniUtubyimba tw'umwaloni200 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Isekuru n'UmuhiniIsekuru n'Umuhini
2

Steep hot

Cover the powder with water in a pot and keep it hot, not boiling, for an hour or two. Leave it overnight.

Ibikoresho by'iyi ntambwe:

AmaziAmazi2 litiro

Ibikoresho bikenewe:

Inkono NiniInkono Nini
3

Strain

Strain the brown liquid through cloth and squeeze the residue. Steep the residue once more and add that liquid.

Ibikoresho by'iyi ntambwe:

AmaziAmazi1 litiro

Ibikoresho bikenewe:

Umwenda wa fromajiUmwenda wa fromaji
Inkono NiniInkono Nini
4

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.

Ibikoresho bikenewe:

Inkono NiniInkono Nini
Isahani yo kumishaIsahani yo kumisha
Isahani y'umucangaIsahani y'umucanga
Isekuru n'UmuhiniIsekuru n'Umuhini
Icupa ry'IkirahureIcupa ry'Ikirahure
5

Yield

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Ibikoresho

2

Ibikoresho bikenewe

7

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Sand Bath in a Sunk Iron Pan

Sand Bath in a Sunk Iron Pan

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