DIY silver hammered straighten and patina.

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Bambamsdadda
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DIY silver hammered straighten and patina.

Post by Bambamsdadda » Sun Nov 12, 2017 10:24 am

Morning all.
I found a hammered the other day that was a touch bend. As it wasn't of great value I decided it would be a good coin to try and strighten.

THIS IS NOT A HOW TO GUIDE, THIS IS JUST A DOCUMENATION OF WHAT I HAVE DONE PLEASE DONT TRY AND REPLICATE THIS!!

What I used.

I had made a butane blow torch a while back for a blacksmithing forge. I used that to heat the coin.
Pliers to hold it.
Two pieces of wood to flatten the coin.

Firstly I held the coin in the flame until it was hot enough to feel like it was starting to straighten between the two pieces of wood. Once it felt like it was hot enough I simply put my weight on the wood with the coin sandwiched in the middle. And it straightened out remarkably well! There were a few areas where it's badly bent like on the "C" of CIVITAS, I hammered those out by hand very carefully, also the two pin hole size dents to achieve the look in forth picture.
For some reason, hearing the coin had takes away nearly all the dark patina. I like liver hammereds to have a dark background with lighter markings, I think it makes them easier to see.

IMG_8743.jpg
IMG_8738.jpg
IMG_8739.jpg
See how there's now no patina left after heating.
IMG_8740.jpg

So now I'll explain how I added some patina to the coin, then remove some off the details.

What I used:

A boiled egg
A sealed jar
Tinfoil and saliva.

A strange one but it worked well, I hard boiled an egg, chopped it up, chucked it in a jar and popped the coin in, sealed the jar, left it in there a few hours and it came out a lovely dark grey colour.
Next I took the foil, added a little saliva to the coin and rubbed it together until it the highlights were easier to read and bobs your uncle.



So it seems I have reached my image upload limit for today. So that means.........
I HAVE TO LEAVE YOU HANGING ;;z
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Last edited by Bambamsdadda on Sun Nov 12, 2017 10:40 am, edited 1 time in total.
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Re: DIY silver hammered straighten and patina.

Post by Bambamsdadda » Sun Nov 12, 2017 10:34 am

Hang on a minute........


Here's the rest of the pictures!!!

IMG_8744.jpg
After a few hours in the egg!
IMG_8741.jpg
Heres the final product after taking off some of the darker patina on the higher spots!
IMG_8742.jpg
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Re: DIY silver hammered straighten and patina.

Post by Bambamsdadda » Sun Nov 12, 2017 10:37 am

A before and after ::g

IMG_8746.jpg
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Re: DIY silver hammered straighten and patina.

Post by Ollie K » Sun Nov 12, 2017 10:44 am

That came out great! Love the egg tip- how did you discover that?!
Cheers, Ollie ::g
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Re: DIY silver hammered straighten and patina.

Post by Bambamsdadda » Sun Nov 12, 2017 10:54 am

Ollie K wrote:
Sun Nov 12, 2017 10:44 am
That came out great! Love the egg tip- how did you discover that?!
Cheers, Ollie ::g
I researched how to patina silver jewellery, I had no idea it worked so well.
Apparently it's the sulphur in the egg that does it. It gives off a smell similar to the smell you get when using foil to take patina off.
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Re: DIY silver hammered straighten and patina.

Post by Ollie K » Sun Nov 12, 2017 10:59 am

I wondered if there was a correlation between the egg and the sulphur. That's useful to know- never liked the idea of using bleach really!
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Re: DIY silver hammered straighten and patina.

Post by Steve_T » Sun Nov 12, 2017 11:09 am

Useful info ::g I guess the older the egg there would be a higher concentration of Sulpher, really old addled / rotten eggs stink

Every days a school day, were now doing chemistry lol

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Re: DIY silver hammered straighten and patina.

Post by Ten pence! » Sun Nov 12, 2017 1:08 pm

What a waste of eggs! :))

You can darken silver coins in seconds by simply putting them in bleach.

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Re: DIY silver hammered straighten and patina.

Post by Oxgirl36 » Sun Nov 12, 2017 1:15 pm

Like the idea of the egg, less harsh than bleach. Must admit though the bleach works well, followed by a pencil eraser rather than the tin foil. Nice job with your approach.

For anyone interested this month's Treasure Hunting mag (Dec 17) gives a great step by step guide to straightening silver coins. Tried it and very impressed.
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Re: DIY silver hammered straighten and patina.

Post by cookertron » Sun Nov 12, 2017 1:22 pm

With my 2nd hammered coin I thought I could straighten it by hand and snapped it, then took the two halves to show a friend at his house and lost one bit of it. Gutted but lesson learnt!

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Re: DIY silver hammered straighten and patina.

Post by Easylife » Sun Nov 12, 2017 2:11 pm

Nice job and eggspertly done ! :))
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Re: DIY silver hammered straighten and patina.

Post by Aquila » Sun Nov 12, 2017 2:16 pm

I'm sorry, but as someone who loves history I definately prefer original patina - the proof of authenticity, than a fake one produced by... eggs. I can understand straightening bent coins and basic cleaning, but in my opinion the less we do to our finds the better. These things are relics, it's better to not find them at all than find and damage or destroy them afterward. Would you throw a celtic sword or a Augustus' statue into bowl of eggs? Would guys from British Museum do that?
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Re: DIY silver hammered straighten and patina.

Post by mrix » Sun Nov 12, 2017 3:55 pm

Aquila wrote:
Sun Nov 12, 2017 2:16 pm
Would you throw a celtic sword or a Augustus' statue into bowl of eggs? Would guys from British Museum do that?
If your already aware the the coin is not of any significant historical or monetary value then surely this procedure is totally acceptable ::g


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Re: DIY silver hammered straighten and patina.

Post by Bambamsdadda » Sun Nov 12, 2017 4:08 pm

Aquila wrote:
Sun Nov 12, 2017 2:16 pm
I'm sorry, but as someone who loves history I definately prefer original patina - the proof of authenticity, than a fake one produced by... eggs. I can understand straightening bent coins and basic cleaning, but in my opinion the less we do to our finds the better. These things are relics, it's better to not find them at all than find and damage or destroy them afterward. Would you throw a celtic sword or a Augustus' statue into bowl of eggs? Would guys from British Museum do that?
That's a fair comment, in the most part I agree.

However, just to reiterate:
Bambamsdadda wrote:
Sun Nov 12, 2017 10:24 am
I found a hammered the other day that was a touch bend. As it wasn't of great value I decided it would be a good coin to try and strighten.
Bambamsdadda wrote:
Sun Nov 12, 2017 10:24 am
THIS IS NOT A HOW TO GUIDE, THIS IS JUST A DOCUMENATION OF WHAT I HAVE DONE PLEASE DONT TRY AND REPLICATE THIS!!
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Re: DIY silver hammered straighten and patina.

Post by Raymond » Sun Nov 12, 2017 4:49 pm

It looks well
Nice one

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Re: DIY silver hammered straighten and patina.

Post by redwulf500 » Sun Nov 12, 2017 5:47 pm

Hi nice job and as it's your coin you can do what you want with it...... ::g

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Re: DIY silver hammered straighten and patina.

Post by sweepstick47 » Sun Nov 12, 2017 11:11 pm

That's a novel approach but possibly at the cost of an egg! and being a Yorkshireman!!..... :-O

Bleach can be used, butI find the patina can easily be replaced (if polished out etc.) by applying a light covering of powdered sulphur (available from the chemist) then place in a sealed jar etc or loosley wrap in brown paper. The end result (in my opinion) should then be very lightly 'dusted' with a soft cloth to highlight the raised detail.

I've always found the simplest and safest way of straightening a silver coin without damaging it (and also leaving the finish/patina exactly as it was when found), is to roll the coin, using a series of graduated wooden 'dowels' starting with a 'cocktail stick' size and progressing in stages to about 10mm. The final size dowel required, will vary depending upon the diameter of the coin being straightened.

It's worth adding that the task is made considerably easier by heating up the coin with boiling water several times during the process. Thanks for the interesting boiled egg trick ::g
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Re: DIY silver hammered straighten and patina.

Post by targets » Mon Nov 13, 2017 2:07 pm

just leave coins in a box of rubber bands and they soon go black and save on an egg

rubber bands have lots of sulphur in them and blacken silver
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