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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.
Mwanzo
Two days
Maagizo
1
1
Crush the galls
Crush the galls
Weigh the dry galls and pound them to a coarse powder in the mortar.
Vifaa kwa hatua hii:
Vinundu vya mwaloni200 gZana zinazohitajika:
Mizani ya mizani-mbili
Kinu na mchi2
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.
Vifaa kwa hatua hii:
Maji2 litaZana zinazohitajika:
Sufuria Kubwa3
3
Strain
Strain
Strain the brown liquid through cloth and squeeze the residue. Steep the residue once more and add that liquid.
Vifaa kwa hatua hii:
Maji1 litaZana zinazohitajika:
Kitambaa cha jibiniSufuria Kubwa4
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.
Zana zinazohitajika:
Sufuria Kubwa
Sahani ya Kuvukizia
Bafu la mchangaKinu na mchi
Chupa ya Kioo5
5
Yield
Yield
Inapakia daftari la Jupyter…
Zana Zinazohitajika
7- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
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