Sulaiman
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Candles for heating test tubes
 
Nothing new, posted just because I thought I'd mention/remind the use of candles for heating test tubes.
My spirit lamp recently died but I wanted to make a little nickel nitrate,
IKEA GLIMMA candles to the rescue.
0.3g nickel, 10ml 1M HNO3, 1.4ml 10% H2O2 in a 20ml soda-lime glass test tube,
... boil, simmer or keep hot depending on gap between test tube and flame.
4 hours per £0.025 candle.
Useful for daily use and especially for 'emergency' use.
Not sure if the nickel will 'dissolve' but the candle works well 
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fusso
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Why is the solution yellow not green?
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Ubya
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those are some cheap candles
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Morgan
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That was a funny comment.
Another heat source made from a tealight candle ...
https://youtube.com/watch?v=HxsJna3tMF4
[Edited on 30-8-2018 by Morgan]
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unionised
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The big problem is soot.
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Ubya
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the problem would be real with a flame producing a column of black soot but if the wick is well made and you keep the test tube outside the flame cone
of the candle it shouldn't be a problem
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Sulaiman
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These candles seem to be smokeless so as above ... no soot.
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The yellow/orange is dissolved NO2 caused by earlier boiling,
there is no green because a negligible quantity of nickel has dissolved 
(if no change by tomorrow I'll ruin the stoichiometry and add some rfna)
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unionised
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Candles must have improved since I was a schoolkid. (Meths was too expensive).
I did try using what would now be called and "air bath"- a small tin can heated in the flame. The can got sooty, but the tube inside stayed clean.
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