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As they are at least double the price of the cheap welding gauntlets, in say, Toolstation,
let's hope someone has done some checking.The chromium in the tanning chemicals is the hexavalent chromium,
you know, the star heavy metal contamination in the water supply in the Erin Brockovich movie.
https://www.theguardian.com/lifeandstyle/2016/sep/20/chromium-6-erin-brockovich-chemical-threatens-two-thirds-of-americans-erin-brockovich
I've used these for a couple of years, and ain't dead yet (though the heavy metals point hadn't occurred to me - I presume they're food safe...):
https://www.bakerybits.co.uk/professional-leather-oven-gloves.html