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Glass Muller and Slab for Grinding Pigments
Painters and colourmen grind pigment into oil or gum with a muller, a heavy bell of glass or stone with a flat face, rubbed over a slab; Andrew Ure (1839) describes indigo and gold leaf ground this way. Gather glass rod into a solid bell in the flame, anneal it, then grind its face and a glass slab against each other with grit so they bite.
The picture: grinding a red pigment with a glass muller.
中级
A day with annealing and grinding
说明
1
1
Gather the glass
Gather the glass
Melt the end of thick borosilicate rod in the torch and keep feeding rod into the gather, turning, until you have a heavy, bubble-free lump.
此步骤所需材料：
硼硅玻璃棒4 个所需工具：
台式玻璃吹制喷灯
安全眼镜
耐热手套2
2
Shape the bell
Shape the bell
Press the soft lump on the marver to a flat-faced bell and draw the top into a knob to hold. Keep it turning so it stays round.
所需工具：
台式玻璃吹制喷灯
滚料板（玻璃成型用平铁板）耐热手套3
3
Anneal slowly
Anneal slowly
A thick solid piece cracks if it cools fast: put it straight into the kiln at annealing heat, soak it well and cool very slowly.
所需工具：
窑炉4
4
Cut the slab
Cut the slab
Cut a square of thick glass sheet for the slab.
此步骤所需材料：
玻璃板1 个所需工具：
玻璃刀安全眼镜5
5
Grind them together
Grind them together
Put wet grit on the slab and rub the muller face over it in figure-eights until both surfaces are evenly frosted and flat to each other. Wash clean.
此步骤所需材料：
碳化硅磨料50 克
水2 升6
6
Glass for the muller
Glass for the muller
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