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Pawelpksa

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About Pawelpksa

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  • Website URL
    http://pksa.nazwa.pl/blog

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  • Gender
    Male
  • Location
    Poland
  • Interests
    traditional shaving, photography, pottery

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  1. Pawelpksa

    glazing in red and black

    here is another attempt with agateware, no glaze, porcelain
  2. Pawelpksa

    Shrinking ratio

    It is hard to belive to myself but at first attempt I manage to get exact size. I assumed shrinking ration at 0.84%, fired bisque and then to 1250C. My main worry was abou the possible change in shape, but it is not titicable. I documented the whole process in my blog.
  3. Pawelpksa

    Shrinking ratio

    Thanks to all. No hydraulic press. But I can dry with some weight on it. Then I will report to you back.
  4. Pawelpksa

    Shrinking ratio

    Hi, I try to make porcelain scales for straight razor. Crazy! Yes, but I want to try. Has anyone tried something similiar? My first challange is to measure it's lenght and width properly to foresee shrinking level. Normally my porcelain shrinks (for the given temperature) to 0.84 of wet dimention. Do you have any help, experience regarding this? Does shrinking change depending on the shape of the body - scales are think and long. The other challange will be the deformation in firing process (bending). Any hints?
  5. Pawelpksa

    Chromium oxide green at high temp

    Ok, convinced - thanks for saving my health (serously). Theoretically I know it but often tend to think that practice is different. I have an opportunity to see some old traditional potters who still produce their glazes from lead and copper oxides themselves and use for food crocks. In then wonder - that was practiced for centuries.. We don't have easy access to Maison Stains here, in Poland. I use mainly Terra-color, but their stains are encapsulated. At the moment I used their pigments. Some of them contain Cd but are declared as encapsulated as well. They are declared as for body clay or glazes. See here the catalogue. Now, the QUESTION: What is more in the stains comparing to simple pigment? Does it preserve color better? Regards
  6. Pawelpksa

    Chromium oxide green at high temp

    Yes, I understand. Firing takes place in garage. Throwing is the issue. Thanks all for the wornings, I appreciate much. Any comments on change in color shade after firing?
  7. Pawelpksa

    Chromium oxide green at high temp

    and there wil be no food contact with it but yes, other pots will be fired the same time
  8. Dear, I added 10% of chromium oxide green to white porcelain and want to use it in agateware for firing in cone 6-8. Do you have experience how the green color changes in such scenario? Will the oxide affect white part of the body?
  9. Pawelpksa

    Single fire vs Bisque and Glaze

    see Simon Leach youtube, he recenlty tries ones firing
  10. Pawelpksa

    glazing in red and black

    Thanks. I'm also surprised by the match in colors and quality of the red glaze. I expected troubles. At the moment I've received pigments and will experiment with agateware, probably later will need to glaze with transparent glossy. This is not an order, just fun. BTW, there is inner part of the box, also in black and red stripes.
  11. Pawelpksa

    glazing in red and black

    I made first attempt with red glazed rim and strips. Results can be seen in this video (turn off audio, but the starting picture shows the resul). Next will be stains (Terra-color) in clay body - agateware.
  12. Pawelpksa

    glazing in red and black

    Thanks, sounds nice. At the moment I try to do agateware with stains for the clay body. If done I will post results. Later I may try with underlazes but I'm bit afraid of my low paiting/brushing capabilites.
  13. Pawelpksa

    glazing in red and black

    Mason stains are not available in Poland. Terra-Color provides some nice red pigments. Both formulas from mason and terra, as well as from others, contain cadmium. Terra declared they use inclusion pigment. So, I will try to do Agateware with porcelain colored with black and red pigments. Later, I can post results. I still need to read and learn how to handle cadmium based powders and wet clay in a safe way.
  14. Pawelpksa

    glazing in red and black

    I made something like this in the picture by mixing porcelain with the same porcelain coloured with blue pigment and then throwing that on the wheel. I’m not sure if that is marbling or nerikomi technique (?). The effect is nice and would fit for the purpose if I do the same with black and red pigments. But….. Red pigment is an issue. I looked into 3 different local pottery suppliers and cannot find red pigment. They offer various colors but not red. There is red-brown or pink, but that all is far away from red (any similar to the red of the razor’s scales). Do you have any experience with red pigment which can be used in cone 6? I found some over-glaze paints with beautiful reds which get mature at 800C or 1050C but they require quick cycles (30 or 60 min) which is not achievable in home studio. The red rim would be an option, but all red glazes which I used in past (3-4) are kind of running glazes, so the rim is the worse place to apply them. Can you give suggestion for high temperature nice red not running glaze? I have not experience with underglazes at all One update. I have found red pigment. The issue is that it contains cadmium and Terra-Color does not say (unless I'm wrong) if after firing in 1250C with the porcelain or clay it becomes safe.
  15. Hi, I'm looking for a tip how to achieve the following effect in glazing. See the picture of lava flow. It is black with grey patches and red lines. What you see in the photo is not ceramics but I need to emulate it on a ceramic. I have a razor with scales from this material and now need to make a box for shaving foam (quite similiar to a regular butter bell) and shaving scuttle. I thought about glazing white clay with glossy black glaze, waxing , then scrubbing the unregular lines and then adding red glaze. Does it make sense or there is better method? I also have problem with red glaze itself. I go for cone 6 and the red glazes that I use run and tend to change color. Can you recommend good one? thanks
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