[Jewelry making - Article 01762] - Re: [Orchid] To quench or not to quench, that is the question

[John Donivan]

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>     I don't know about cherry red, to some people it's black and to
>     others it's clearly white!!! Anneal for a brief moment, anneal for
>     enough time for the crystals to grow 

    Helen, I'll be first in line to hope this is my last post on this
    tired subject. There is no misunderstanding, there's only
    misinformation. First - annealing is a time/temperature curve. Add
    temperature, reduce time. Add enough temperature, and it becomes no
    time, as in "It's done". That's annealing temperature - no time.
    Second - if you heat something up hot enough, it glows - "becomes
    incandescent". The colors of temperature have been known since the
    before dark ages, and are well defined. If you are heating copper or
    gold, the reddish color of the metal can fool the eye, but that's
    only light. If you heat a piece of steel, a piece of copper and a
    piece of glass all to 1500F in a dark room, they will all be roughly
    the same color, because it's not color, it's incandescence. The
    terminology of hot color mostly comes from blacksmithing and steel,
    because it's important to them and because it's easy to see the
    colors in the neutral metal. The rest of the world uses the same
    terminology because it is the common language. These have been
    quantified in great detail, as I'm including in some links below. I
    would simply suggest that if someone thinks that cherry red is
    something else, that they go back to school. What happens on an
    atomic level is handy to know, somewhat theoretical (we can't
    actually watch it happening), and esoteric. The important thing to
    know is how to get soft, undamaged metal. Again, the colors under
    about 1000F are for oxide layers in steel. 

    http://www.threeplanes.net/toolsteel.html
    http://www.knives.com/heatreat.html
    http://tinyurl.com/34z3xa
    http://tinyurl.com/3b5uky only to 1000F, but show how deep people get
    http://www.engnath.com/public/harden.htm
    http://tinyurl.com/yntv3f
    http://www.beautifuliron.com/usingthe.htm

    I could probably find more, but enough. Cherry red is mentioned in
    these a couple of times (it is "full red" in others). Some go
    farther and call the 1400F area Cherry red, and 1500F bright cherry
    red. It's just not a matter of opinion, mine or others. It is
    quantified and defined. Learn it. 

http://www.donivanandmaggiora.com
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