Letter 16047

Avoiding blue sealing blooms [India]  

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How can I avoid blue sealing blooms after black anodizing and hot sealing , and if I can't avoid how can I remove it without buffing?

Nilay Gholkar
- Mumbai, INDIA

A well maintained Nickel Acetate (mid-temp) bath should give satisfactory sealing without the seal smut. Sealing dyed parts in boiling water without any additives is not the way to go, as most dyes will leach out a little bit into your seal bath, thereby contaminating your seal.

Marc Green anodizer - Boise, ID, USA

Hello Nilay,

You need to try to keep a close eye on your dye and nickel seal temp and PH. it is a must. Also you may be keeping you seals to long. Hot water seal change every day or so. Nickel seal, a week or so depending on your work volume. Check with your suppiler.

Dwayne Conley
- Dayton, Ohio

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