[Clayart] cobalt toxicity
mwendt at wendtpottery.com
Thu Aug 26 02:30:45 UTC 2021
I looked at the EPA web page for drinking water standards.
Copper and Barium are both listed so I bet you can review the standards for
cobalt there too.
I figured if the release level in a test is lower than the drinking water
standards, the release is most likely very safe since we drink far more
water in a lifetime than you could ever possibly release into food coming
into momentary contact with dishes or serving pieces.
Worth a look if you can slog through the pages,
----- Original Message -----
From: "Cynosure -Arts" <cynosure_arts at hotmail.com>
To: <clayart at lists.clayartworld.com>
Sent: Tuesday, August 24, 2021 12:18 AM
Subject: [Clayart] cobalt toxicity
Hello - I have sent a glaze sample to the lab to test for cobalt leaching
and awaiting results, but I am having difficulty finding online a simple
number to compare the results to re: acceptable leaching. I did find one
source that quoted 1.5 ppm. Can anyone point me in the right direction?
I'd love to be able to confidently use this glaze for food surfaces. It
passed the at-home acid and alkali baths with no apparent surface change.
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