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Ox Gall Liquid Clarified with Alum and Salt, Ure 1839
Ox gall makes watercolours spread evenly and fixes them, but raw it stains with its own green. Andrew Ure (1839): boil and skim the gall, dissolve alum in one half and salt in the other, let both settle three months, then mix the clear parts in equal measure: the colour falls out and leaves the gall clear.
The picture: our diagram of the two settled halves mixed to a clear liquid.
Baguhan
Three months
Mga Tagubilin
1
1
Boil and skim
Boil and skim
Boil the fresh gall and skim it. Divide it into two equal halves.
Mga materyales para sa hakbang na ito:
Sariwang apdo ng baka2 litroMga kailangang kasangkapan:
Malaking Kaldero
Butas-butas na sandok
Panggatong
Gwantes na goma2
2
Alum and salt
Alum and salt
Into one half stir powdered alum and keep it on the fire until dissolved; into the other, common salt, dissolved with heat (step 5). Cool each and bottle them separately, loosely corked.
Mga materyales para sa hakbang na ito:
Tawas (Potassium Alum)50 g
Asin sa mesa50 gMga kailangang kasangkapan:
Almires at Panghalo
Timbangang panimbangMalaking Kaldero
Mga boteng salamin na may tapon3
3
Settle three months
Settle three months
Leave both bottles about three months in a moderately warm place, until a thick sediment has fallen and the liquid is clear.
Mga kailangang kasangkapan:
Mga boteng salamin na may tapon4
4
Mix and clear
Mix and clear
Pour off the clear part of each and mix them in equal measure: the remaining colour curdles and sinks. Let it settle, pour off the clear gall, and filter it through paper if you want it finer.
Mga kailangang kasangkapan:
Mga boteng salamin na may tapon
Embudong Salamin na May Tangkay
Papel na Pansala5
5
Ure's measures
Ure's measures
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Mga Materyales
3- 2 litroPlaceholder
- Placeholder
- 50 gPlaceholder
Mga Kinakailangang Kasangkapan
9- Placeholder
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