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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.
Ophakathi
A day with annealing and grinding
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Induku Yengilazi Ye-borosilicate4 izicucuAmathuluzi adingekayo:
Isibani sokuphephetha ingilazi sasetafuleni
Izibuko zokuphepha
Amagilavu Amelana Nokushisa2
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.
Amathuluzi adingekayo:
Isibani sokuphephetha ingilazi sasetafuleni
I-marver (ipulangwe lokugingqa ingilazi)Amagilavu Amelana Nokushisa3
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.
Amathuluzi adingekayo:
Isithando4
4
Cut the slab
Cut the slab
Cut a square of thick glass sheet for the slab.
Izinto zokwakha zalesi sinyathelo:
Ushidi wengilazi1 ucezuAmathuluzi adingekayo:
Isisiki sengilaziIzibuko zokuphepha5
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.
Izinto zokwakha zalesi sinyathelo:
Amanzi2 amalithaAmathuluzi adingekayo:
Amagcubu e-silicon carbide6
6
Glass for the muller
Glass for the muller
Ilayisha incwadi ye-Jupyter…
Izinto
3- 4 izicucuIsibambeli
- 1 ucezuIsibambeli
- 2 amalithaIsibambeli
Amathuluzi Adingekayo
7- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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