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Norrette Moore

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Apparently this element is now in high demand for the production of rechargeable batteries for electric cars. Not that I am panic buying Cobalt Blue in pure form (PB28) while I can still afford it...😉 Interesting trivia, there is an area in Canada of unmined minerals...a town called Cobalt.
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Tony Auffret

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I suspect supplies of Cobalt Blue (PB28 Cobalt Aluminate, Blue Spinel) will not be too badly hit by the battery business.  Most Cobalt is produced as a by-product of Nickel and Copper mining.  After that the main ores are combinations with arsenic or arsenic and iron, often as some form of oxide but not  PB28, Co(2)Al(2)O(4), a sort of cobalt aluminium oxide.  Aluminium is made principally from Bauxite, which is a mainly aluminium tri-hydroxide, so PB28 is probably safe from the aluminium industry too
With Sarah, Phil, Ellen, Rose the dentist, and the granddaughter whose name I forget.

Robert Jones, NAPA

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Your reassurance, Tony, is most welcome - I'm a great fan of well-made Cobalt Blue, in all media.  Got to be the real thing, though, and not some mix of pthalo blue with a bit of white.  PB28 every time - though even that can vary, as can the related Cerulean Blue: vary in strength, I mean; try the Daler Rowney Coeruleum (which is Cerulean) and then the Rembrandt Cerulean, ditto with the Cobalt Blues - while I prefer the Rembrandt versions, I wouldn't decry the Daler Rowneys ... (a great company, with a rotten PR department, but that's something else again).