Where does “কাঁচ” come from?

কাঁচ (Bengali) comes from Sanskrit काच — glass; crystal, quartz; alkaline salt, block salt.

কাঁচ (Bengali): glass

Definitions

Step	Language	Word	Meaning
1	Sanskrit	काच	glass; crystal, quartz; alkaline salt, block salt

কাঁচ — Etymology, Origin & Word History | Etymology Explorer