[Jewelry making - Article 00184] - Re: [Orchid] Instead of talc?

[Todd Hawkinson]

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Dear Martin,

    Non lab grade Magnesium Carbonate has been the main mold talc I have
    used for many years. Used in my casting experience for over 40
    years. 

    Currently though I have been in love with Gerber Baby powder for my
    mold talc. It is mostly corn starch, about 98%. They don't make it
    any more so I bought every bottle I could find. After you powder your
    molds you should always use an air jet to blow all the excess powder
    away. I get good waxes every time with great detail. I understand
    Arrow root powder is also excellent mold talc. I've not tried it. 

    I would speculate if you can't get the detail in your waxes you may
    either be using the wrong kind of injection wax or not venting your
    mold properly. The injection machine is also a concern. 

    Every place air will run into a dead end should be cut for vent and
    wax release. Think of the finger of a glove. If wax were injected
    into this kind of mold the end would have to be vented to allow the
    displaced air someplace to go.  

    On gum rubber molds I do prefer silicone spray. But spray and let
    dry for a few minutes before injecting. 

    What material mold are you using? This may impact the powder choice.
    Silicone, gum rubber or metal molds all have varying working
    properties. 

Best Regards.
Todd Hawkinson

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