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It's definitely not something I would use. Is it for the colour response of colouring oxides you want to use it or to create a matte or just because it's part of a recipe you use? Strontium carbonate can be subbed at 75% of the amount of barium carbonate that is called for in the recipe but if it's the main flux in the glaze it won't have the same colour response,  "barium blues" for example won't look the same. Much of the danger of barium carbonate is to the potter making the glaze but any surface used for food surfaces should be tested for leaching. If the glaze isn't a fully melted stable glass there will be barium leaching. Good article on barium safety here

Welcome to the forum :)

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I've read that the main problem with barium is that the desirable effects it causes also cause it to be nondurable.  So a glaze that doesn't work with a strontium substitute will not be durable with barium.

Edited by liambesaw

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