[Jewelry making - Article 00978] - [Orchid] Annealing Precious Metals

[GaPawn]

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    The article by Prof. Dr. Erhard Brepohl in the #116 issue of "Tips
    From the  Jewelers Bench" is chock full of fabulous information.  

    http://www.ganoksin.com/borisat/nenam/metal-rolling-n-drawing.htm 

    Not the least of which is the tidbit on pulling 2 pieces of stock
    through a  round drawplate to create 2 pieces of half-round wire!! 
    (Duh,  I'd NEVER have thought of that one on my own!) 

    My questions though, concern the annealing chart, figure 4.48. I'm
    having a  hard time deciphering all the info presented therein and
    knowing what  corresponds to which. 

    1. Do the bars or the dots represent the elongation % and conversely
    which  one represents the annealing temperature? 

    2. When a wire has been elongated by 70% does that mean a 1mm thick
    wire  now has a thickness of .7mm or .3mm? At what elongation %
    should I do my  anealing? 

    3. Concerning the numbers above the metal symbol/euro karat; it 
    appears that the numbers above the AG represent the fineness, while
    the first 1  or 2 digits of those above the AU categories represent
    the applicable karat, but  I have no clue as to what the second 2
    digits represent. 

    4. There was no mention of the amount of time one should hold a 
    given metal at the desired temperature. I have been cooking mine for
    20 minutes.  Is that sufficient or too much? 

    5. Lastly, I have been quenching my wire in chlorinated city tap
    water,  then pickling. I know that chlorine is detrimental to
    precious metals, should I  be using distilled water for this
    operation, or would another liquid be better  suited to the task? 

    Any other annealing tips/tricks are heartily invited. Thanks in
    advance for helping me to sort through these annealing 
    intricacies!! I expect I'll be saying Duh again, very shortly!   :-) 

Steve Stempinski
Steve's Place
Jewelry Repair  While-U-Watch

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