Aluminum anodizing is essentially "clear" or light in colour except Type III in mil spec thicknesses which then look dark grey/blackish. It is porous and can be dyed by filling the pores with a dye and then coating with a sealant of some sort.
The Type III is inherently coloured dark grey/black due to the fineness of the pores and the depth of them, preventing proper light transfer through them. It really doesn't take dye well since its so fine and thick.
Commercial hardcoat anodizing is usually "thin" .0002-.0005" thick. The dark Type III is >.001" thick.
The Type III is inherently coloured dark grey/black due to the fineness of the pores and the depth of them, preventing proper light transfer through them. It really doesn't take dye well since its so fine and thick.
Commercial hardcoat anodizing is usually "thin" .0002-.0005" thick. The dark Type III is >.001" thick.