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Salmiak was sold as a powder in a tube as candy in The Netherlands ( at least in 70s and 80s ).

It's difficult to find pictures of it, but this one is close to how I remember it: https://i.pinimg.com/1200x/b3/0d/94/b30d94aaec9669bc45fd0f23...

Except for the pixelation! That didn't exist back then.

But this is the stuff I was talking about, thanks.