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Black dust on dyed black anodized aluminium

Q. Hi everyone,

I'm having trouble when dying anodized aluminium with black dye. When the aluminium comes out from the dye tank, a sort of black smudge or dust sticks to the piece and can only be removed easily with an eraser. It is like a film of dust.

61726-1b 61726-1c 61726-1a

Doesn't happen on new formulated dye, only when it has been already used for a while (from weeks to a couple months).

Thanks and regards

Victor Perez
- Logroño (Spain)
September 4, 2024

A. Victor

2 of the photos suggest solution is drying on the surface of the part. Consider walking the line to see where it occurs and implement appropriate controls.

Willie Alexander
- Green Mountain Falls, Colorado

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