Chemical Solutions

Anodizing Dyes

There are four ways to color anodized aluminum: Electrolytic Coloring, Integral Coloring, Interference Coloring & Organic Dye Coloring.  Organic dye coloring is most commonly used in Type II anodizing and there are an extensive range of colors available. Dye samples are available upon request and JSA Technical Services can help you match any color. When requesting samples, please provide the following information:

  • Anodizing Parameters – bath temperature, current density, coating thickness, etc.
  • Color – description and/or samples of the color to match
  • Size of the dye tank
  • Quantity of dye required for testing
  • Address where to send the samples


Aluminum anodizing can produce a structurally rigid porous surface finish that will absorb a colorful range of organic dyes. The following factors affect the dye color:

  • Concentration of the dye and age of the solution
  • Dye immersion time
  • Temperature of the dye
  • Buffering and pH of the dye
  • Thickness of the anodic coating
  • Pore structure of the anodic coating
  • Water quality – hard water can have negative effects

The following contaminants can also affect dye absorption:

  • Phosphate
  • Chlorides
  • Silicates
  • Sulfates
  • Fluorides
  • Metallic contaminants: Aluminum, Copper & Lead