Letter 17058

Rainbow shade in anodised section (India) 

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

Iwant 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.

Iwant 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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