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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.
Advanced
A day
Instructions
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.
Materials for this step:
Soda-Lime Glass Cullet1 kg
Cobalt Oxide1 g
Copper Oxide30 gTools needed:
Digital Kitchen Scale2
2
Melt
Melt
Melt the cullet and colourant together in a crucible in the kiln until the glass is fluid and evenly coloured.
Tools needed:
Kiln
Clay Crucible - Refractory
Crucible Tongs
Welding Gloves
Safety Glasses3
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.
Tools needed:
Pontil Rod
MarverKilnWelding GlovesSafety Glasses4
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.
Tools needed:
Pontil RodWelding GlovesSafety Glasses5
5
Break into lengths
Break into lengths
When cold, score with a file and snap into lengths of 10 to 15 cm.
Tools needed:
Metal FileSafety Glasses6
6
Colourant and rod length
Colourant and rod length
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Materials
3- Placeholder
- 1 gPlaceholder
- 30 gPlaceholder
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