Quality Dyes for the Anodizing and Metal Finishing Industries
Frequently Asked Questions

» How much dye should be used in a tank?
» Can more or less dye be used than the recommended concentration?
» What is the best way to store unused dye?
» How long will unused dye last before it expires?
» Can non-deionized water be used for the dye bath?
» How critical is the dye bath pH and/or temperature?
» How should a dyed part be sealed?
» Why is the color uneven across or in different areas of the part?
» Why do small white spots appear on finished parts?

How much dye should be used in a tank?
The amount of dye required will vary, depending on the tank size. Our home page has an easy to use calculator for all Bright Dyes® Anodizing Dyes, which will calculate the dye required based on either the tank�s dimensions or its capacity. Please note that the calculator is based upon a concentration of 10 g/L for black dyes and 2 g/L for non-black dyes.
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Can more or less dye be used than the recommended concentration?
Yes, but we generally use 2 g/L as a baseline for non-black colors. However, the user can vary the concentration to fit specific needs.
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What is the best way to store unused dye?
Dye is best kept in a closed container in a cool, dry place, away from sunlight.
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How long will unused dye last before it expires?
When stored per the recommended method, the dye itself has a virtual indefinite shelf life.
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Can non-deionized water be used for the dye bath?
Yes it can but deionized, reverse osmosis, or distilled water is strongly recommended. Regular tap water can be hard and contain high levels of calcium and chlorine, resulting in white spots after a part is sealed and has dried.
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How critical is the dye bath pH and/or temperature?
The recommended ranges may vary by color but are important in achieving consistent results across dyeing runs. The ranges have been determined as a result of laboratory tests to ensure repeatable quality performance.
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How should a dyed part be sealed?
Our 7000 Powder Sealer and 9000 Liquid Sealer are both compatible with all Bright Dyes® colors, are easy to use and maintain, and will meet current seal tests.
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Why is the color uneven across or in different areas of the part?
The part may not have been cleaned well prior to anodizing. Thoroughly cleaning and rinsing between steps are both critical to achieving a uniform color. Additionally, dye bath agitation is recommended to maintain a consistent bath temperature. If a very quick dye time is required, parts on the bottom of a rack may appear a different color than those on the top.
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Why do small white spots appear on finished parts?
White spots are easy to spot on colored work. They are often caused by foreign contaminants attaching themselves to parts and preventing dye penetration. They can also be the result of sulfuric acid from the anodizing bath being carried into the dye bath which can be prevented by steps such as a neutralization rinse before dyeing.
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