its called fire scale. it creates an oxide of the metal.What is it when you pour liquid onto steel and ignite it to get a colorful 'stain' on the metal when finished?
oxides of Fe and Cr formedWhat is it when you pour liquid onto steel and ignite it to get a colorful 'stain' on the metal when finished?
Art.
Patination? I used patination (patina) on a bronze cast sculpture in my first year of uni. I brushed the bronze surface with chemicals and heated the metal with a blowtorch to produce a coloured, aged bronze effect.
See source below for more info :)
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