Close up of my finger brushing the aluminum plate with a mix of white powder and water. The last polishing step.
After polishing, more polishing.
Close up of copper sulfate crystals, the size of sand but so turquoise that seems wet.
Copper sulfate crystals are of a shiny turquoise, like a breeze in summer dusk after a storm.
The oxidation process of the aluminum plate is bubbling nice and I am not prepared for a sound recording of it.

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