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tline3open  Please explain cold soulder to me

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Author Topic:   Please explain cold soulder to me
Jane Straub
iconnumber posted 06-26-2005 08:06 PM           Edit/Delete Message   Reply w/Quote
In 18th century jewelry frequently diamonds were souldered into gold jewelry in sterling silver. This was done by 'cold soulder'. How is it done? Thank you.

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iconnumber posted 06-27-2005 12:54 PM     Click Here to See the Profile for IJP     Edit/Delete Message   Reply w/Quote
Hi, Jane, and welcome!

The American Heritage dictionary offers this

Deliberate coldness or disregard, a slight or snub. For example, When I said hello to her in the library, she gave me the cold shoulder and walked away.

Just kidding. I hope Scott doesn't castigate me too bad for that.

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Jane Straub
iconnumber posted 06-27-2005 02:17 PM           Edit/Delete Message   Reply w/Quote
Sorry about that, a typo, It's COLD SOLDER . Does anyone know how to cold solder?

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iconnumber posted 06-28-2005 10:47 AM     Click Here to See the Profile for FredZ     Edit/Delete Message   Reply w/Quote
I am not certain if this technique was called "cold soldering". I know of a technique that uses fine gold or fine silver foil to force around stones in a setting. The foil can be burnished so that it does not look like crumpled foil.


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Scott Martin
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iconnumber posted 06-28-2005 11:19 AM     Click Here to See the Profile for Scott Martin     Edit/Delete Message   Reply w/Quote
From: The Manufacturer and Builder August 1882, page 186

Fletchers Formula for Cold Soldering.

Mr. Fletcher, of Warrington, England, whose name will be recalled by many of our readers in connection with his valuable improvements in gas furnaces and chemical apparatus, proposes the following method for soldering without the aid of heat. Many formulas for this purpose have been proposed from time to time, but when put to the test are usually unsatisfactory. We give the following because of our favorable knowledge of its proposer. The operation demands the preparation of a flux and a solder, the directions for preparing which are given herewith:

One part of metallic sodium to 50 or 60 parts of mercury. These combine on being shaken in a bottle; or the amalgam may be bought from any dealer in chemical supplies. It must be kept in a well stoppered bottle to exclude the air, which would otherwise oxidize the mass. It has the property of amalgamating (equivalent to tinning by heat) any metallic surface, cast iron included.

Make a weak solution of sulphate of copper, about an ounce to a quart of water. Precipitate the copper by rods of zinc; wash the precipitate several times with hot water, drain the water off, anti add for every 8 ounces of precipitate 6 or 7 ounces of mercury; add also a little sulphuric acid, to assist the combination of the two metals. When combined, they form a paste which sets intensely hard in a few hours. It should be made, while still pasty, into small pellets. When required for use, one or more of these pellets should be heated until the mercury oozes out from the surface in small beads; these should be shaken or wiped off, and the pellet rubbed in a mortar with a pestle until it forms a smooth, soft paste.

When this is put on a surface that has been previously amalgamated with the sodium-mercury amalgam, it adheres firmly and sets very hard in a few hours. The joint can be parted, if necessary, either with a blow of the hammer or with the cold chisel, or by a heat about sufficient to melt plumbers solder.

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iconnumber posted 06-28-2005 11:47 AM     Click Here to See the Profile for Antiqueperson     Edit/Delete Message   Reply w/Quote
Gosh, I don't know where you find these things. I looked for this. Thank you.

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iconnumber posted 06-28-2005 10:26 PM     Click Here to See the Profile for agleopar     Edit/Delete Message   Reply w/Quote
Thanks Scott, a most interesting addition to the list of cool techniques to keep for that project that has no other solution!

My first thoughts were cold welding, as I have not heard of cold soldering. Freds foil technique also is used to bind gold to base metals. Thin foil burnished onto a textured background.

On reflection I think that Georgian jewelers used low temperature or soft solder, basicly lead solder, to do the tricky bits after the body of the ring was hard soldered (high temperature silver or gold solder).

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