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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.
初学者
Three months
说明
1
1
Boil and skim
Boil and skim
Boil the fresh gall and skim it. Divide it into two equal halves.
此步骤所需材料：
新鲜牛胆汁2 升所需工具：
大汤锅
漏勺
薪柴
橡胶手套2
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.
此步骤所需材料：
明矾（钾明矾）50 克
食盐50 克所需工具：
研钵与研杵
等臂天平大汤锅
带塞玻璃瓶3
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.
所需工具：
带塞玻璃瓶4
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.
所需工具：
带塞玻璃瓶
带颈玻璃漏斗
滤纸5
5
Ure's measures
Ure's measures
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