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  Beretta
« on: January 25, 2014, 17:22:28 PM » by BLACK EAGLE
A new feature on a high value shotgun.
http://www.beretta.com/en/so-sparviere/#Main
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  Re: Beretta
« Reply #1 on: January 26, 2014, 15:19:56 PM » by RB
Work of art!

RB
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The Bright Side: "Sir! We're surrounded!" - "Excellent! We can shoot in any direction!"

  Re: Beretta
« Reply #2 on: January 30, 2014, 09:55:41 AM » by Vincent
Beautiful !
I wonder if the finish is in-the-white carbon steel.
Reminds me: One can use a carbon steel gun without a specific bluing or similar finish.
Care is rather particular: After use, you dont clean it right away. Instead you just brush teh surface with a fine steel wire brush and oil only for storage. In time it will develop into a transparent grayish finish with pleasing highlights around prominent edges.
The process is a little like very slow rust blue.
You might have noticed the same effect on well trod steel manhole covers and grills.
With Black powder guns that are boiled clean, the process is speeded up.

Not for the impatient modern man.
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  Re: Beretta
« Reply #3 on: January 30, 2014, 12:08:19 PM » by magnum
That's interesting Vincent. What you are describing is the way to a natural patina on carbon steel in the white. My question is how you can achieve that patina (which takes time and burnishing by cleaning), without the dreaded appearance of rust spots? It must require a very good protective oil.
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  Re: Beretta
« Reply #4 on: January 30, 2014, 13:03:52 PM » by RB
Under the impression that it's always the oil that provides the protection, blueing is just cosmetic.

RB
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The Bright Side: "Sir! We're surrounded!" - "Excellent! We can shoot in any direction!"

  Re: Beretta
« Reply #5 on: January 31, 2014, 09:32:34 AM » by Vincent
The chemical goings on are really very simple.
iron rusts when it combines with oxygen in the air.
It can forms more than one oxide types :
iron (iii) oxide Fe2O3 ( red rust)
iron (ii) oxide FeO (black)
iron (ii+iii) Fe4O5 (black)

Ordinary red rust is predominantly red iron oxide.
The blue black luster film on guns and some tools is generally a mixture of both types ii and iii

You can convert type iii ( red) into types ii and iii (black) by heat.
Its not a precise reaction and many oxide and hydrate combinations can form, depending on moisture in air, iron impurities, temperature, duration ect.
But to get to your question Magnum, of how to get the patina without the dreaded rust spots, well you cant !
if you look closely at even the finest of the finest rust blued shotgun, you will see that the surface is not shinely. In fact its a collection of very fine pits and bumps. The craft involved in rust bluing is concerned with getting that uniform, transparent satin sheen on the metal.
Many factors can contribute, but clearly, its important NOT to allow the red rust spots to get too deep and large.
So I would say that you have to rub off the surface OFTEN with the finest steel brush or wool you can find.
You can occasionally boil in very clean or distilled water every now and then, BEFORE you brush.

All said its all down to your "sensitivity" to the nature of iron. Every lump might rust in a different way in its enviroment.
A black powder firearm, a carbon steel dagger, an nice steel forging, etc etc might be a good item to practice on.

Use, allow to tarnish, ( occasional boil) brush, oil for storage only.


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  Re: Beretta
« Reply #6 on: January 31, 2014, 09:38:03 AM » by Vincent
PS :
"Allow to tarnish" can take months to years.
To speed up you can use a weakened mixture of vinegar and water.
Be carefull not to allow the red rust to take hold too much.
The red film should consist of tiny spots that are as fine as possible.


Many variables involved. Just try it out slowly.
I had an old pair of damascus twist barrels that would fine-rust in white vinegar mix in 1 hour.

You can control the final colours between brown and black, by reducing or increasing the heat stages: No heating cycles=brown, with heat ( boiling) =black.
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  Re: Beretta
« Reply #7 on: February 02, 2014, 21:27:40 PM » by Mike




qisu farfett dan is senter!!!
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  Re: Beretta
« Reply #8 on: February 03, 2014, 19:32:01 PM » by BLACK EAGLE




qisu farfett dan is senter!!!
X-toqba trid taghmel gol but, biex tixtri farfett bhalu !!  Grin Grin
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 (Read 2635 times) [1]
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