[Jewelry making - Article 01097] - [Orchid] Casting problems

[WorldofOpal]

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    I have been having a casting problem. There is a crust that forms on
    the casting and button. It is a medium gray color as opposed to the
    white on the investment and always has a discoloration and porosity
    underneath. It is very hard and must be chipped or scraped off. It
    forms around the edge of the button in most cases but also extends
    on spots to the rest of the casting. It seems to be mostly on the
    bottom half of the casting. I am using Satin Cast 20, centrifugal
    casting, plenty of flux, and an oxygen acetylene torch. I have
    altered about all the temperatures on the oven and metal to correct
    the problem. Nothing seems to help. What do you expert casters think?


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