Not sure if this is the right place for this video, but it has tools and talking in it...
This is actually one of the first video ideas I had back in the day, but only now got around doing it!
SculptyWorks (Nov 26, 2019)
You might try a product called Tempil. It's a crayon type marker applied to the object your are heating. The tempilstik is manufactured in many different temperatures. You would need to know what the minimum range and the maximum range to achieve your anneal process. It might even differ depending on the aluminum alloy used.
SculptyWorks (Dec 1, 2019)
I have always used soap. Simply wet a bar of soap and rub the area you wish to anneal, making sure to leave a thin layer of soap on the surface. Now heat the aluminium from the other side (not the soaped side). Once the soap layer turns black, you are done. When bending/shaping is complete, simply wash off the soapy layer.
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