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Silicon mark

I am dealing with die cast aluminium anodising. Sometimes I face problem of silicon mark on the surface which makes the surface very bright upon dyeing ('cos that area doesn't have pores to trap dye). What I can do to reduce that mark?

Huey Siong
- JB, Johor, Malaysia

My recommendation would be to have a higher fluoride content in your acid desmut step - the fluoride will do a great job of removing the silica and reducing shiny spots.

Dan Brewer
chemical process supplier - Gurnee, Illinois

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