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Coloured Glass Rod: Cullet Coloured with Cobalt or Copper, Pulled Between Two Punties
Charlie

Yenziwe ngu-

Charlie

17. uMfumfu 2026DE
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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.
Osezingeni eliphezulu
A day

Imiyalelo

1

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.

Izinto zokwakha zalesi sinyathelo:

Izicucu zengilazi ye-soda-umcakoIzicucu zengilazi ye-soda-umcako1 kg
I-cobalt oxideI-cobalt oxide1 g
I-Copper OxideI-Copper Oxide30 g

Amathuluzi adingekayo:

Isikali Sedijithali SasekhishiniIsikali Sedijithali Sasekhishini
2

Melt

Melt the cullet and colourant together in a crucible in the kiln until the glass is fluid and evenly coloured.

Amathuluzi adingekayo:

IsithandoIsithando
Imbiza Yobumba Emelana NomliloImbiza Yobumba Emelana Nomlilo
Udlawu Lwesitsha SokuncibilikisaUdlawu Lwesitsha Sokuncibilikisa
Amagilavu okushiselaAmagilavu okushisela
Izibuko zokuphephaIzibuko zokuphepha
3

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.

Amathuluzi adingekayo:

Uthi lwe-pontilUthi lwe-pontil
I-marver (ipulangwe lokugingqa ingilazi)I-marver (ipulangwe lokugingqa ingilazi)
IsithandoIsithando
Amagilavu okushiselaAmagilavu okushisela
Izibuko zokuphephaIzibuko zokuphepha
4

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.

Amathuluzi adingekayo:

Uthi lwe-pontilUthi lwe-pontil
Amagilavu okushiselaAmagilavu okushisela
Izibuko zokuphephaIzibuko zokuphepha
5

Break into lengths

When cold, score with a file and snap into lengths of 10 to 15 cm.

Amathuluzi adingekayo:

Insimbi yokuhlikihla izinsimbiInsimbi yokuhlikihla izinsimbi
Izibuko zokuphephaIzibuko zokuphepha
6

Colourant and rod length

Ilayisha incwadi ye-Jupyter…

Izinto

3

Amathuluzi Adingekayo

9

Le blueprint yenza

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Isibambeli

Uthi lwengilazi — i-soda-lime, enombala

Free

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Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Glass Cullet: Scrap Glass Sorted, Cleaned and Broken

Glass Cullet: Scrap Glass Sorted, Cleaned and Broken

ngu-BubblesIT

Umsebenzi Wengilazi

9
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Cobalt Oxide: Cobalt Ore Roasted to Drive Off Arsenic, Ure 1839
Yingozi

Cobalt Oxide: Cobalt Ore Roasted to Drive Off Arsenic, Ure 1839

ngu-CharlieDE

Inorganic

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Copper(II) Oxide by Heating Copper in Air

Copper(II) Oxide by Heating Copper in Air

ngu-CharlieDE

Amakhemikhali

17
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CC0 Isizinda Somphakathi

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