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Coloured Glass Rod: Cullet Coloured with Cobalt or Copper, Pulled Between Two Punties
Lampworkers' rods were first drawn by hand from the furnace. Melt soda-lime cullet with a little cobalt oxide for blue or copper oxide for turquoise, take a gather on a punty, roll it on the marver, then two people pull it out between two punties to about pencil thickness. It cools in minutes; break it into short lengths.
The picture: our diagram of the pull.
高级
A day
说明
1
1
Weigh the batch
Weigh the batch
Weigh clean cullet and the colourant: 0.25 to 1 g cobalt oxide per kg for blue, or 20 to 30 g copper oxide per kg for turquoise.
此步骤所需材料：
钠钙玻璃碎料1 公斤
氧化钴1 克
氧化铜30 克所需工具：
数字厨房秤2
2
Melt
Melt
Melt the cullet and colourant together in a crucible in the kiln until the glass is fluid and evenly coloured.
所需工具：
窑炉
耐火黏土坩埚
坩埚钳
电焊手套
安全眼镜3
3
Gather and marver
Gather and marver
Take a gather on the end of a punty, roll it on the marver into a short cylinder, and reheat it until evenly soft.
所需工具：
粘杆
滚料板（玻璃成型用平铁板）窑炉电焊手套安全眼镜4
4
Pull the rod
Pull the rod
A helper presses a second punty onto the free end. Walk apart, keeping the rod straight, until it is about pencil thick. Lay it down to cool.
所需工具：
粘杆电焊手套安全眼镜5
5
Break into lengths
Break into lengths
When cold, score with a file and snap into lengths of 10 to 15 cm.
所需工具：
金属锉安全眼镜6
6
Colourant and rod length
Colourant and rod length
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