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Rainbow shade in anodised section (India)

It comes to my notice that some aluminium section reflects rainbow colour after anodising in sulphuric acid. Why? please suggest.

I want to Know about multicolour technology for colouring aluminium- the chemical used, working parameters, the type of bath used with metals used as cathode and anode, rectifiers etc.Kindly suggest.

I want to know the method to calculate the anode to cathode ratio in electrocolouring bath as well as in anodising bath containing sulphuric acid - stannous sulphate(For colouring bath). Can I use lead(hollow type / flat) in anodising bath as cathode and flat type as anode? Kindly suggest.

Abhijit kumar Datta
- Kolkata, West Bengal, India

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