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Annealing Precious Metals


#1

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

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! :slight_smile:

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