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Water Glass: Ground Flints Boiled in Caustic Soda Lye, Ure 1839
Water glass is silica dissolved in caustic soda: a thick, syrupy liquid that sets to silica gel when acidified. Andrew Ure (1839): boil ground flints in strong caustic lye until the liquor is nearly twice as heavy as water. Hot caustic lye burns skin and eyes: goggles and gloves.
The picture: our diagram of the boil and the hydrometer check.
中级
Two days
说明
1
1
Grind the flints
Grind the flints
Break flint nodules small with a sledge, grind them to a powder and sift it (ours).
此步骤所需材料：
燧石结核1 公斤所需工具：
大锤
研钵与研杵
细目筛
等臂天平
防尘口罩
安全眼镜2
2
Boil in lye
Boil in lye
Boil the flint powder in strong caustic soda lye in an iron cauldron, stirring, topping up with water as it boils away.
此步骤所需材料：
烧碱（氢氧化钠）2 升所需工具：
大铸铁锅
薪柴
木桨
水
化学防溅护目镜
橡胶手套3
3
Boil to strength
Boil to strength
Keep boiling until a cooled sample reads close to 2 on the hydrometer, nearly twice as heavy as water.
所需工具：
比重计大铸铁锅化学防溅护目镜橡胶手套4
4
Strain and store
Strain and store
Let it settle, strain the syrupy liquor through cloth from the undissolved grit, and keep it in a closed jar.
所需工具：
布（过滤用）
玻璃罐化学防溅护目镜橡胶手套5
5
What it holds
What it holds
正在加载 Jupyter 笔记本…
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