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Re:Glazes induced degradation of tea catechins by lm28469 on Monday September 18, 2023 @05:45AM (#37554118)
> Is it really the metal from the spoon depositing on the mug?

Probably, it's additive for sure, you can remove them quite easily: https://www.reddit.com/r/CleaningTips/comments/11z7get/thoug...

Set glazing basically is glass, you wan't scratch that very easily

Re:Glazes induced degradation of tea catechins by ce4 on Monday September 18, 2023 @11:08AM (#37557178)
Here's the safety data sheet of the product:

https://www.barkeepersfriend.com/wp-content/uploads/2014/12/...

Here are the ingredients:

Feldspar

Sodium dodecyl benzene sulfonate

Oxalic acid