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Good question. In fact I just read something that suggests that back in the early days of ENO salts there might not have been baking soda (sodium bicarbonate) in there, and no carbon dioxide would have been produced. There may have also been some magnesium in them, as some other brands of fruit salts had (i.e., epsom salt). Physicsjock (talk) 00:15, 25 October 2024 (UTC)Reply