Quote Originally Posted by analoguey View Post
Anything more benign? Like the caffenol stuff?

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Sodium thiosulphate is sold as cattle food additive. You can probably find some in a farmer's co-op or supply store (whatever you call that in India). That is where I have seen it cheapest locally.

If it is benign enough for cows to eat, it is probably benign enough to handle without gloves.