REMOVING DYE
You may find that a mistake has been made on your work-piece, perhaps the color is wrong, whatever the reason, you have to remove some, or all, of the dye. As long as the part has NOT been sealed, most dyes will easily be removed by immersing in household bleach. We've found that our black dye (the most dense color) whites out in about 1 minute with a splash of bleach.
SEALING THE ANODIZE WITH ANODIZING SEALANT
Anodizing Sealant is a nickel acetate compound for sealing anodic coatings on aluminum. It is a fine flowing greenish powder, readily soluble in water and specifically formulated with a pH regulator and an agent to help minimize smut. Anodizing Sealant is suitable for clear anodize and offers increased weather and light-fastness on coatings dyed with aluminum dyes.