Metaldye Black 2

Metaldye Black 2 is a Light fast and heat fast neutral black dye suitable for exterior application. The dye bath is stable against contamination by drag-in of sulfates or aluminum salts from the anodizing electrolyte.




Physical appearance: Black to dark grey powder
Chemical description: Metalized azo dyes
Light fastness: 8+
Heat fastness: Excellent




Anodic coating thickness: 10 - 25 microns
Concentration: 5 - 8 g/l
pH range: 4.5 - 6.0
Buffering: Sodium Acetate or Acetic Acid
Dye bath temperature: 50° - 60° C
Immersion time: 10 – 20 minutes




The dyed oxide film must be properly sealed properly using a hot sealing product from ALFISEAL range for best result.

Other Recommendation:

1) Ammonium compounds shall not be used for controlling of the pH or to buffer dye bath solution.

2) The presence of ammonium compounds in the sealing solution may cause leaching and loss of color.

3) Use sodium acetate for dye buffer.

4) Adequate care to be taken for proper rinsing to control drag-in for optimum tank life.

5) Dye may be dissolved separately outside the dye bath. Use demineralized water for better dye bath stability.

6)  The life of dye bath is reduced by water containing ammonium.


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