UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
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.
Hagati
A day with annealing and grinding
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Agati k'ikirahure cya borosilikate4 ibiceIbikoresho bikenewe:
Itara ryo ku meza ryo guhuha ikirahure
Amadarubindi y'umutekano
Uturindantoki twihanganira ubushyuhe2
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.
Ibikoresho bikenewe:
Itara ryo ku meza ryo guhuha ikirahure
Marver (urupapuro rwo kuzunguza icyuma cy'ikirahure)Uturindantoki twihanganira ubushyuhe3
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.
Ibikoresho bikenewe:
Itanura4
4
Cut the slab
Cut the slab
Cut a square of thick glass sheet for the slab.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'ikirahure1 igiceIbikoresho bikenewe:
Igikata ikirahuriAmadarubindi y'umutekano5
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.
Ibikoresho by'iyi ntambwe:
Amazi2 litiroIbikoresho bikenewe:
Udukombe twa karubide ya silikoni6
6
Glass for the muller
Glass for the muller
Gupakira ikaye ya Jupyter…
Ibikoresho
3- Umwanya
- 1 igiceUmwanya
- 2 litiroUmwanya
Ibikoresho bikenewe
7- Umwanya
- Umwanya
- Umwanya
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