Talk:Intrepid Potash

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Copper sulfate?

Copper sulfate is not what is used to make the potash evaporation ponds near Moab UT blue. According to the book Potash: Deposits, Processing, Properties and Uses, by Donald E Garrett PhD, Chapman & Hall 1996, in Ch 4 Solution mining, bromcresol green is the dye used. It is blue at pH > 5.4 (see https://en.wikipedia.org/wiki/Bromocresol_green). Copper sulfate is both toxic to wildlife and at higher pH would precipitate copper hydroxide.