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http://technical-articles.hooverandstrong.com/wordpress/porosity-the-jewelers-nightmare/
Jun 01, 1999 · Porosity and Other Casting Flaws By Tom Weishaar and Mark B. Mann. Results of Improperly Cast Jewelry. Gas porosity. This may be scattered throughout the piece of jewelry and also may concentrate in corners, such as at the junctions of prongs or in galleries. It shows itself as tiny holes or blotches on highly polished surfaces. Shrinkage porosity.
https://www.romanoff.com/help-info/how-to/casting/porosity-the-facts.html
Gas porosity can also occur in the same piece along with shrinkage porosity and hot tears, although all three usually occur only in the heavy sections of the casting. The most common causes of shrinkage porosity can be found in the design of the jewelry piece itself — primarily in very abrupt changes from heavy sections to thin sections, or ...
https://orchid.ganoksin.com/t/casting-porosity/1562
Hi all, this is my first post so I hope I get it right. I seem to have inherited a porosity problem lately and I cant figure it out. Maybe someone could help me. In the last couple of years, I have been getting “shrinkage” porosity in some of my castings. The only thing I can attribute it to is the silicon copper alloys that I have been using. It seems that when I cast with “old ...Estimated Reading Time: 5 mins
https://www.callagold.com/problem-solving/re-tipped-prongs-porosity-rings/
Porosity in jewelry can be like an iceberg. I once went to polish out a little porosity hole. And I polished and polished. And the hole got bigger. As the wheel spun down as I turned it off, I looked at the ring I'd been so excited to set and said, "nope. That design is going back to casting." Vacuum Casting to Avoid Porosity Problems
https://orchid.ganoksin.com/t/porosity-in-castings/60262
May 12, 2020 · Hello all I recently set up a casting studio after a long hiatus from making jewelry. I was given a Victor Oxy acetelyne torch with a standard pointed tip for melting metal, mostly silver. I am getting a lot of porosity in my castings. The last time I can the pieces looked almost like filigree. I used silver with a deox alloy. I believe that the problems are being caused by the acetelyne torch ...Estimated Reading Time: 4 mins
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