[Jewelry making - Article 01593] - [Orchid] Expansion of the investment during burnout

[Chris]

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    Hello...........By way of introduction.....a tip. 

    When casting, shrinkage is, for the most part, expansion of the
    investment during burnout. To reduce the expansion immerse the mold
    in 105F water immediately after pouring the investment. Leave it in
    the water until it sets. I use a 5 gallon aquarium with a heater so
    the temp stays constant. I learned this trick 35 years ago when I
    set up a dental lab and was casting crowns. They have to fit
    perfectly the first time. I've not found an investment that this
    doesn't work with but try it on a non critical piece first. 

Chris
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