2019 Stephen Hawking Silver Proof 50p Coins: Obverse Toning
Here at Coin Hunter we have 26 United Kingdom Royal Mint silver proof 50p coins created in 2019 to mark the life and work of Stephen Hawking. Every single coin has already toned on the obverse side, see images below.
Toning on recent coins in black foam, where the coins have been stored in the same conditions as older silver proof coins that show no signs of toning. The 2017 and 2018 coins are held in place with white foam.
The question we have to ask is: Does the black foam contain a chemical component that is not coin safe?
We also need to consider why only the obverse of the Stephen Hawking 50p is toning so quickly in the black foam. It should be noted that the screw capsule has the screw thread which will let in air on the obverse side - and that the reverse is sealed from the air by the tight fit of the foam itself.
White Foam: No Toning
2017 Beatrix Potter Jeremy Fisher Silver Proof 50p
White Foam: No Toning
2018 Snowman Silver Proof 50p
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3307
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3293
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3292
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3299
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3272
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3267
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5483
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3263
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5474
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3271
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3264
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3269
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3274
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3289
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3261
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3279
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3277
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3278
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3281
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3290
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3262
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5471
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5480
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3280
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3273
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3282
