Author Topic: Bombay Presidency, Akbar II, AE Pice, Ahmadabad, AH1234/ RY14  (Read 150 times)

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Offline capnbirdseye

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Bombay Presidency, Akbar II, AE Pice, Ahmadabad, AH1234/ RY14
« on: December 14, 2018, 06:27:31 PM »
Bombay Presidency, Akbar II, AE Pice, Ahmadabad, AH1234/ RY14,

I managed to get most of the green gunge off but it still needs a bit more treatment
Vic

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Re: Bombay Presidency, Akbar II, AE Pice, Ahmadabad, AH1234/ RY14
« Reply #1 on: December 15, 2018, 12:28:57 AM »
Instructive picture. On its own, the cleaned coin looks somewhat like it is cast, therefore fake, but the pair shows the small dimples were caused by corrosion, not casting. Here, the many pinholes are close together, but had the coin been less corroded, it would have been more difficult. Thank you, capn.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline naabh4

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Re: Bombay Presidency, Akbar II, AE Pice, Ahmadabad, AH1234/ RY14
« Reply #2 on: December 15, 2018, 01:04:46 AM »
Really great job on the coin, Victor! Could you please share how you did it :)?

Offline Arminius

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Re: Bombay Presidency, Akbar II, AE Pice, Ahmadabad, AH1234/ RY14
« Reply #3 on: December 15, 2018, 09:17:13 AM »
Really great job on the coin, Victor! Could you please share how you did it :)?

(My guess: boiling in soda solution plus repeated treatment by a stiff nylon brush.)

Offline capnbirdseye

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Re: Bombay Presidency, Akbar II, AE Pice, Ahmadabad, AH1234/ RY14
« Reply #4 on: December 15, 2018, 10:42:47 AM »
Really great job on the coin, Victor! Could you please share how you did it :)?

It's as I've mentioned on other threads, a 15 minute process using Sodium Hydroxide which is more commonly known as Caustic Soda & used as a drain cleaner, used with caution it can give remarkable results on copper coins
I got the basics of the method from video of a coin conservator at the BM and adapted it. it leaves the patina untouched and is completely stable on all the coins copper I've used it on.

However I just put some powder in a jar, drop the coin in and pour in near boiling water, stand back as it froths up & spits, leave 20 seconds , tip the water into another container , remove the coin & scrub with bristle nail brush,  drop it back in and repeat

The video is still available
http://www.dailymotion.com/video/x23sq12_cleaning-coins_lifestyle
Vic