UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA

Copper Carbonate: Blue Vitriol Precipitated with Washing Soda
Pour washing soda into a solution of copper sulfate and a pale blue sludge falls out; warm it and it turns into a dense green powder. George Fownes (1856) gives this as the way the pigment is made; it is close in make-up to the mineral malachite. Potters and glassmakers use it as a copper colour.
The picture: a heap of basic copper carbonate powder.
Utangiye
A day with drying
Amabwiriza
1
1
Two solutions
Two solutions
Dissolve the copper sulfate in one beaker of warm water and the washing soda in another.
Ibikoresho by'iyi ntambwe:
Sulufate y'umuringa ifite amazi atanu (CuSO4·5H2O)250 g
Sode yo kumesa290 g
Amazi2 litiroIbikoresho bikenewe:
Umunzani w'ibiro
Igikombe cy'Ikirahure
Urubaho rushyushya
Amadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusu2
2
Pour in the soda
Pour in the soda
Pour the soda slowly into the copper, stirring; it froths as gas comes off. A pale blue sludge falls out. Stop when more soda no longer makes any.
Ibikoresho bikenewe:
Igikombe cy'Ikirahure
Akati k'Ikirahure ko Kuvanga
Amadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusu3
3
Warm it green
Warm it green
Warm the mixture gently and stir. Fownes: the precipitate becomes dense and turns green.
Ibikoresho bikenewe:
Igikombe cy'Ikirahure
Urubaho rushyushya
Akati k'Ikirahure ko Kuvanga4
4
Wash and dry
Wash and dry
Filter it, wash it several times with clean water to take out the sodium sulfate, and dry it in a dish at low heat. Store the powder in a closed jar.
Ibikoresho by'iyi ntambwe:
Amazi2 litiroIbikoresho bikenewe:
Urupapuro rwo Kuyungurura
Akayunguruzo k'Ikirahure Gafite Umugozi
Isahani yo kumisha
Icupa ry'Ikirahure
Amadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusu5
5
Soda for the copper
Soda for the copper
Gupakira ikaye ya Jupyter…
6
6
Limits
Limits
The precipitation and the change to green are Fownes's; the quantities are ours. Copper salts are harmful if swallowed; do not breathe the dry powder.
Ibikoresho
3- 290 gUmwanya
- 4 litiroUmwanya
Ibikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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