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topic 58978

Anodizing dye tank has a scum on it

A discussion started in 2012 & continuing through 2017 . . .

October 16, 2012

Q. I have been searching for an answer to a question pertaining to red anodizing dye. I had noticed a scum has formed on the top of my dye. Is this still good to use? Finding the scum tells me my container is not air tight, so I am wondering if this will affect the dye in any way.
Thank you

Tanya Downey
- Bassano, Alberta, Canada

October 17, 2012

A. Tanya

The 'scum' could be algae. Check with your supplier for recommendations on how to prevent it from occurring. Some dyes require an elevated minimum temperature to prevent the formation of such.

I would think it would still be good for most uses, although I would filter and/or skim first. You could always send a sample to your supplier for analysis.

Willie Alexander
- Colorado Springs, Colorado

October 24, 2012

A. Some dye baths will grow mold which can be picked up by the anodized aluminium where it will act as a resist and prevent build-up of dyestuff on the affected areas. You can skim the mold off of the top and some dyes will allow you to raise the temperature around 90 °C to kill most of the mold spores.

Scott Merritt
- Eastman, Georgia, USA

Fungus in brown dye

May 31, 2017 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. I work in an anodizing shop and our brown dye, Sanodure aluminum olive brown r2, is constantly foaming. It's the worst of all the dyes. I've been told it's due to a fungal growth in the tank. But even after draining, cleaning, and rebuilding, it has remained foamy. Any help is greatly appreciated. Thank you.

Justin Perry
Anodizer - Jackson, Michigan
  ^- Privately contact this inquirer -^

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