I have my late grandpa’s silver spoon attached to my fridge with a neodymium magnet. What kind of chemical reaction causes that discolouration?
I have my late grandpa’s silver spoon attached to my fridge with a neodymium magnet. What kind of chemical reaction causes that discolouration?
it didn’t spread from the magnet, it literally corroded everywhere except for the part of the surface under the magnet, which means the magnet shielded it from some environmental factor that caused the corrosion
Then how do you explain the bottom side? (And that the rest of the spoon looks regular silver /gray)
Serious question.
Edit: okay, I found that it starts at yellowing through reds then blues towards black. Can the back side have anything to do with the aluminum sign that hangs below?
And I still find it weird that there’s some kind of aura around the magnets contact area.
The bottom side wear is probably largely wear from the spoon slightly wobbling every time the fridge door is opened and closed.
Regarding the magnet contact area, the magnet was blocking most of the ambient air from the silver. Given that the spoon was where most spoons live anyways, the kitchen, consider all the food scents and vapors it has experienced on the fridge, that likely accounts for the sulphur oxidation others have mentioned.