Coloring of anodized aluminium ware we perform using two methods:
Colours for external use: black blue red and others. Colours for internal use: natural (satine) light brown (C 32) medium brown (C33) dark brown (C-34) and black (C-35) gold (Z-32) gold (Z-33) gold (Z-34) and old gold ( Z-35)
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It is an application of heavy metals' ions(Cu, Ni, Sn, Mn) into procured porous layer of aluminium oxide on aluminium surface under influence of electricity. By the virtue of this method we can attain many shades of brown and a colour imitating the look of acid-proof steel. The colours attained in electrochemical process charaterize theirselves by very high resistance to light exposure. 
or non-organic coloring agent through porous layer of aluminium oxide made on aluminium during the process of anodizing. This coloring can be done on all kinds of aluminium except for alloys with high percentage of silicon. It has to be taken into consideration that for different kinds of aluminium attained shades of colour will be different. It stems from properties of their anodic layers.