For the toning experts
I've never bought/owned a coin that had no toning and held it until it did...until now. Any toned coins I've ever owned were old and purchased that way. In 2021 I bought this 2 oz Australia piece new and most likely just because I liked the platypus. A spontaneous moment whether wise or not. Anyway, I go into my safe tonight and see it has a light pink toning starting around the rim. When I bought it was spotless and went right into the capsule the same day. I'm no expert on toning or that process as I've always bought blast white coins or old US 1800's. I thought rim toning happened over years and not this sudden. I didn't do anything to the coin with the intention for it to tone. Is this due to temperature in my safe or chemical on the coin from the minting process? Or can coins just start to tone in 18 months (give or take). I have not tried any AT experiments at all on this so genuinely curious.
Best to look at the rim at the 11:00 position but it looks light in the photo than it when the coin is in hand.
Pocket Change Inspector