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cracked pot

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Everything posted by cracked pot

  1. I know this has been covered many times before but this is a new wrinkle for me. Glazes and clay have been used many times before with no problems. This time I made two casserole dishes which were thrown on bottomless the wheel, stretched oval then had a bottom added with a coil for strength on the inside and smoothed. Now pieces are pinging and I can see crazing if I look closely around the coil added area. Can the extra thickness and smoothing cause this? Thanks.
  2. Another Pinging Question

    Curt, Thank you for your reply. This sounds like a likely cause. The crazing is only around the joined area. Guess I will keep these baking dishes for myself and observe. Thanks
  3. Another Pinging Question

    Never had any crazing before with this glaze(Falls Creek Shino) but may have put it on thicker as I wanted it to look more white than brown. Other bowls in load did not have this problem. The crazing is very fine and can only be seen in very direct sunlight and then, only if you are looking for it and only at the join. One of the casserole dishes sold almost out of my hands from the kiln. Think I will keep the other to monitor it. Pieces still ring true when tapped so don't think there is any compromise of the clay. Thanks for your responses.
  4. Adding Color To Glaze

    I would like to add color to my Falls Creek Shino as discussed on Ceramics Arts Daily. My question is, can I mix a large batch of dry glaze, mix it together well and then divide it out into 100 gm portions to add the colorants. In other words, is it risky to divide up the batch before adding water? Once mixed with water, I don't know how to divide it up and figure out the percentages of color to add.
  5. Adding Color To Glaze

    In my recipe the Zircopax and Tin Oxide are always part of the mix. Alberta Slip 56 Gerstley Borate 19 NC4 or Soda Spar(I use Minspar 200) 9 Silica 9 Lithium Carbonate 7 Zircopax 9 Tin Oxide 5 I use this all the time on the dark clay and it does need a heavy application. I'll try more tests and see what happens. I'm having a lot of fun with this!
  6. pie plate 2

    From the album Cracked Pot

    indigo float with ancient jasper over on red rock clay
  7. Cracked Pot

  8. pie plate

    From the album Cracked Pot

    Magruder red with honeycomb on red rock clay
  9. salt cellar 2

    From the album Cracked Pot

    Falls Creek shino with oribe over on red rock clay
  10. salt cellar

    From the album Cracked Pot

    Magruder red on red rock clay
  11. large bowl

    From the album Cracked Pot

    Magruder red with indigo float on red rock clay
  12. small faceted bowl

    From the album Cracked Pot

    red rock clay with red terra sig and white glaze slip trailing
  13. jar

    From the album Cracked Pot

    matt white with aqua celadon over on red rock clay
  14. jar

    From the album Cracked Pot

    indigo blue on red rock clay
  15. Ginger Jar

    From the album Cracked Pot

    Margruder red and indigo blue on red rock clay
  16. small jar

    From the album Cracked Pot

    Magruder red and honeycomb on red rock clay
  17. Large serving bowl

    From the album Cracked Pot

    Panama Turquoise and smoky merlot on red rock clay
  18. Jar

    From the album Cracked Pot

    Weathered Green Bronze on Red Rock Clay
  19. Adding Color To Glaze

    Thanks Old Lady(really hate calling you that) I am reading the book now. High Bridge, I put the glaze on as I normally do, two 5 second dips or three good brushed layers. Still have lots left of the samples so will try it thicker next time. I made one critical error that I know of, I did not mix a cup of the base glaze alone for comparison. I will do that in the next firing to see if I messed up the measuring in this batch. I always write out the formula and check off when each ingredient is added to the bucket but mistakes happen. Thanks for the feedback.
  20. Adding Color To Glaze

    OK, here the results of my experiment with Falls Creek Shino. I mixed a large batch of glaze, mixed well, measured out 100 gm of dry mix into five cups. I added 2 gm of cobalt carbonate, 2 gm copper carbonate, 5 gm teal mason stain, 5 gm leaf green mason stain and 5 gm buttercup mason stain. The results are very dark and the color does not show up unless you have strong light on the piece. I probably won't use these again but it was fun to try. Just bought John Britt's book for cone 6 glazes and will be trying some other glazes to get the colors and surface I want. I used pieces my grand daughters made to test because they had lots of texture. the one photo shows a bowl with the original glaze with a small bowl inside with buttercup stain added. Marcia, I may try your method next time, it seems simpler.
  21. Adding Color To Glaze

    Thanks for your responses. I think I'll stick to the dry method, don't have a math brain. I'll let you know how it turns out.
  22. Wiring For Kiln

    I have to tell you how much I appreciate this forum. I bought my first kiln about four years ago, no experience at all with firing on my own. My electrician ran the 220 line and put a plug on the end in case I ever needed to move the kiln. Soon after that I read here on the forums that hard wiring was better since oxidation in the plug could lead to overheating, Electrician thought this was not likely. Well, just to be safe, I always fire when I'm around and check each time to see if the wire or plug is hot. In my last two firings the plug has been uncomfortably warm so I called the electrician. He checked and everything looked OK but after his vacation he would return to install a box to wire the kiln. I fired one load before he returned since things looked OK. When he came back to rewire and unplugged the kiln from the socket, the socket had melted on one side and showed some burn marks. I was incredibly lucky and would not have kept such a close eye on things if not for all your generous advise. Should probably have followed it in the first place. Thank You.
  23. Adding Color To Glaze

    Thanks for the advise. Looking forward to playing with the colors.
  24. Wiring For Kiln

    High Bridge, I did take off the cover for the electronics to check. No sign of melting or scorching. Thanks.
  25. As Old Lady said, let vinyl rest in sun to flatten. I haven't needed anything else to hold it down. The weight of the wheel does that.

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