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Maybe the key takeaway for real life is to not stir your tea so vigorously that you scratch chunks off your mug. Never assume that other people do or do not do

Maybe the key takeaway for real life is to not stir your tea so vigorously that you scratch chunks off your mug. Never assume that other people do or do not do something that you might find odd.

TheSpiceIsLife 3y ago
No one is scratching fused silica and alumina off their mug with a stainless steel spoon. You can certainly chip it off, but that's a different mechanism of action.
- badcppdev 3y ago
  I think you are totally correct but now I'm stuck trying to find if anyone really knows about the formation of scratch marks inside a mug. Is it really the metal from the spoon depositing on the mug?
  - etrautmann 3y ago
    this seems plausible, as there are often darker marks left on white ceramics from spoons.
  - lm28469 3y ago
    > 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/thought_i_was_going_to_have_to_throw_out_my_ikea/ https://www.reddit.com/r/CleaningTips/comments/11z7get/thoug... Set glazing basically is glass, you wan't scratch that very easily
    - ce4 3y ago
      Here's the safety data sheet of the product: https://www.barkeepersfriend.com/wp-content/uploads/2014/12/SDS_BKF_Cleanser_Polish_6-12-15.pdf https://www.barkeepersfriend.com/wp-content/uploads/2014/12/... Here are the ingredients: Feldspar Sodium dodecyl benzene sulfonate Oxalic acid
  - wil421 3y ago
    Long ago I worked in a restaurant. One day the manager ordered new silverware and we were told to inspect and throw the others away. I was stuck by how much different the forks and spoons were. The forks were shorter by a noticeable length and bent in a different direction. The spoons had obvious wear marks on the bottom and the shape was thin and deformed.
  - ce4 3y ago
    Yes, it is scratched off metal (you see it also on bathroom tiles if you use a bathroom wiper with aluminum frame for cleaning the shower tiles) or from using cast aluminum pans with machined bottom on glass ceramic cooktops (you get little aluminum deposits on the glass). It is reversible and you can "wipe" it off using acid and abrasives but it's tedious as the metal adheres really good to the ceramic.
contravariant 3y ago
It may also help to let the tea sit for less than 6h at 80°C.
_a_a_a_ 3y ago
True, true. I throw away the tea and eat the mug.

Maybe the key takeaway for real life is to not stir your tea so vigorously that you scratch chunks off your mug. Never assume that other people do or do not do something that you might find odd.

TheSpiceIsLife 3y ago

No one is scratching fused silica and alumina off their mug with a stainless steel spoon. You can certainly chip it off, but that's a different mechanism of action.

badcppdev 3y ago
I think you are totally correct but now I'm stuck trying to find if anyone really knows about the formation of scratch marks inside a mug. Is it really the metal from the spoon depositing on the mug?
- etrautmann 3y ago
  this seems plausible, as there are often darker marks left on white ceramics from spoons.
- lm28469 3y ago
  > 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/thought_i_was_going_to_have_to_throw_out_my_ikea/ https://www.reddit.com/r/CleaningTips/comments/11z7get/thoug... Set glazing basically is glass, you wan't scratch that very easily
  - ce4 3y ago
    Here's the safety data sheet of the product: https://www.barkeepersfriend.com/wp-content/uploads/2014/12/SDS_BKF_Cleanser_Polish_6-12-15.pdf https://www.barkeepersfriend.com/wp-content/uploads/2014/12/... Here are the ingredients: Feldspar Sodium dodecyl benzene sulfonate Oxalic acid
- wil421 3y ago
  Long ago I worked in a restaurant. One day the manager ordered new silverware and we were told to inspect and throw the others away. I was stuck by how much different the forks and spoons were. The forks were shorter by a noticeable length and bent in a different direction. The spoons had obvious wear marks on the bottom and the shape was thin and deformed.
- ce4 3y ago
  Yes, it is scratched off metal (you see it also on bathroom tiles if you use a bathroom wiper with aluminum frame for cleaning the shower tiles) or from using cast aluminum pans with machined bottom on glass ceramic cooktops (you get little aluminum deposits on the glass). It is reversible and you can "wipe" it off using acid and abrasives but it's tedious as the metal adheres really good to the ceramic.

contravariant 3y ago

It may also help to let the tea sit for less than 6h at 80°C.

_a_a_a_ 3y ago

True, true. I throw away the tea and eat the mug.