Metal Salt etching of aluminum

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Darth.jpg

One of my first attempts, using a fairly strong etchant

Etch0.jpg

Second attempt, vinyl stickers cut out on the Cricut and stuck to the metal via transfer tape.

Etch1.jpg

After spraying a heavy coat of transparent rustoleum spray paint, I removed the vinyl

Etch2.jpg

While etching in a weak solution (1 T Copper Sulfate, 1 T salt)

Etch3.jpg

As the etch progresses, bubbles bubble and blobs of metallic copper rise to the surface. the smell is kind of ... dusty.

Etch4.jpg

The raw end result has a nice crystalline appearance in the black areas. I wire brushed the lower piece and sanded the high spots with a fine sanding sponge.