If the coating thickness is above 10/m, the tin can be anodized and colored by dipping in different dyestuff solutions. The electroplated and spangled tin is made the anode in a solution consisting of 100 g/l sodium phosphate and 20 ml/phosphoric acid at a temperature of 30-60'C with an applied current of 10-40 amp/ft^2 for 2 minutes, using copper cathodes. The solution is quite stable and the operating conditions for anodizing are not critical. The coating is uniform, dense, and continuous. The anodized tin is porous and capable of absorbing dyes, thus offering a wide scope for producing a variety of colored and multicolored patterns.
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