Coin Hunter

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 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.

2017 Beatrix Potter Jeremy Fisher Silver Proof 50p
White Foam: No Toning
2017 Beatrix Potter Jeremy Fisher Silver Proof 50p
2018 Snowman Silver Proof 50p
White Foam: No Toning
2018 Snowman Silver Proof 50p
2019 Stephen Hawking 50p 3307
3307
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3307
2019 Stephen Hawking 50p 3293
3293
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3293
2019 Stephen Hawking 50p 3292
3292
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3292
2019 Stephen Hawking 50p 3299
3299
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3299
2019 Stephen Hawking 50p 3272
3272
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3272
2019 Stephen Hawking 50p 3267
3267
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3267
2019 Stephen Hawking 50p 5483
5483
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5483
2019 Stephen Hawking 50p 3263
3263
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3263
2019 Stephen Hawking 50p 5474
5474
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5474
2019 Stephen Hawking 50p 3271
3271
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3271
2019 Stephen Hawking 50p 3264
3264
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3264
2019 Stephen Hawking 50p 3269
3269
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3269
2019 Stephen Hawking 50p 3274
3274
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3274
2019 Stephen Hawking 50p 3289
3289
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3289
2019 Stephen Hawking 50p 3261
3261
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3261
2019 Stephen Hawking 50p 3279
3279
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3279
2019 Stephen Hawking 50p 3277
3277
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3277
2019 Stephen Hawking 50p 3278
3278
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3278
2019 Stephen Hawking 50p 3281
3281
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3281
2019 Stephen Hawking 50p 3290
3290
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3290
2019 Stephen Hawking 50p 3262
3262
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3262
2019 Stephen Hawking 50p 5471
5471
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5471
2019 Stephen Hawking 50p 5480
5480
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 5480
2019 Stephen Hawking 50p 3280
3280
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3280
2019 Stephen Hawking 50p 3273
3273
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3273
2019 Stephen Hawking 50p 3282
3282
Black Foam: Toning
2019 Stephen Hawking Silver Proof 50p COA Number: 3282
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