Need advice on Indian Explosives Ltd (ICI India Ltd) to Akzo Nobel

Hi forum,
I have few shares in physical format of ICI India Ltd (Indian Explosives India ltd) which was later on purchased by Akzo Nobel Ltd.
This takeover happened many years back but I didn't got to know. I would like to know what can I do with those physical shares. Will the company exchange them with new Akzo Nobel shares and if anyone has any idea (history information) at what ratio will shares be exchanged.

Waiting for an apt reply from fellow experts.

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