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Found 2 results

  1. Hi guys, I was wondering if anyone has been successful in getting pigment powders to work in decorating your work prior to firing and what are the limitations if indeed it can be done. Most pigments have a temperature threshold before getting destroyed in high temperature firings. Any help would be appreciated.
  2. Hi everybody, This is my first post here, nice to meet you all. I have a question about some result of fired colored porcelain. I am making some unglazed porcelain objects, with the goal of having a very matte finish. Now I have made a test with porcelain colored with a black stain, I have added 4 % to the slip. The stain is based on Co-Fe-Cr, it's standard stain I purchased at a ceramic supplier, the same goes for the slip. What I did: First did a bisque fire (electric kiln) until 950 degree Celsius (1742 degrees Fahrenheit) I removed the objects and finished them (sanding) to a more smooth finish In the kiln again, fired until 1230 degree Celsius (2246 degrees Fahrenheit) The result is a matte looking porcelain, but it has some unwanted glossy spots on the surface (see attached photos). I do not understand why this is happening. Maybe somebody has an idea what could be the cause of this? Thank you in advance. greetings, Patrick Hartog
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