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Rae Reich

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Everything posted by Rae Reich

  1. Try the rutile under, maybe it'll run first.
  2. Actually, @Mark C.just gave us one with his "quick cooling" story in "temp for opening the kiln?"
  3. Good thing you're a philosopher, Hulk. Can't wait to see those next pots!! Drastic/Tragic Learning Experiences - good topic
  4. Jelly molds and bundt pans are designed to release their contents. Put a board over the opening, when the board and mold are turned over the contents should fall straight down and the mold can be lifted up, the piece will be on the board. As the others say, there are a few things you can do to make removal easier, next time. This time, let the clay keep getting drier and try the turned-over-to-a-board thing every day till it comes out. You might kind of smack the board down hard on your table to help jar the clay out, but don't try to pry it out.
  5. Sorry, a joke from the days when no scrap of glaze went unused. All went into one bucket, a test fired, and if/when disappointing, enough red iron oxide was added to make an iron saturate liner glaze.
  6. The shell that has formed by pouring casting slip into a plaster mold and then, after a short period of time, pouring out the excess slip, should not take more than a day to be firm enough to remove. Molds are usually opened as soon as the clay is firm. The piece then continues to dry in the open air. Leaving the form in the mold until dry, unless it is a very simple shape, is likely to cause problems with removal because the casting slip will have shrunk around curves. Removing the form sooner also lets the plaster mold dry sooner, making the next casting sooner. Are you in a climate that is cold and humid? Drying times will often be longer than my generalized, 65-80 degrees F. Are you casting a solid form, rather than a thin shell form?
  7. Thanks! Converted backwards ;( That's an even bigger heated kettle - restaurant?
  8. @lilipil, it seems like you will need a Very Large electric kettle for those amounts, to have nearly *100 lbs (48 kilos?) in your batch. Your melting/heating device size will determine how much you can make at a time. *math corrections welcome
  9. Granular Illmenite is coarse. That's what is used in some speckled glazes for that effect.
  10. But the difference in mass between a small kiln load of Advancers and mullite? Not 30%??
  11. My portable raku dream entailed a Volkswagen bus, a portable wheel and a small soft-brick propane kiln.
  12. Also, do not get the piece to be refired wet!! Sometimes moisture gets into the body and comes out explosively when heated quickly, as one might do with a refire. If it has gotten wet, place in an oven at the lowest possible temperature for several hours, or heat your refiring kiln very slowly.
  13. The gold lustre may look expensive, but its mixed with oil to brush on neatly and a little goes a long way. Fire to 1800F, very low.
  14. Yay! When the clay dries completely in the mold, it will shrink (all clay does, from wet to dry) and can sometimes get hung up where it wouldn't if were only just dry enough to remove. If you do it again, open the mold sooner.
  15. If your mold is white, it's probably made of plaster. Clay poured into a small (under 12") plaster mold, and then poured out after a few or several minutes, will usually be dry enough to remove after a few hours. If you open it by removing the bands and separating the plaster parts, the piece should be dry enough to take out without distortion. If you leave it in for a longer time, it will still probably come out fine When you poured liquid clay (slip) into the mold, did you let it set for a period of time and then empty out the extra slip? If not, you will have made a very solid piece instead of a thin-walled piece. If you just pressed a piece of clay into a one-piece mold, it can be removed as soon as the clay has firmed up enough to keep its shape.
  16. Unless it's in an index, how would I know that solid state relay is SSR? Or vice versa? Just askin'
  17. Does that mean it won't be changed to be perfectly clear to all, even we uninitiated?
  18. Undercut is when the lines of the piece curve inward in a way that prevents the piece from dropping out freely from the mold. Everywhere there is an undercut, there should be a division in the mold so that each piece can be removed without damaging the form. A commercial mold will have been designed to accommodate undercuts. Homemade molds can be learning experiences.
  19. ...leaving a fine coating of alumina, which can be brushed or washed off after firing. A sufficient coating of alumina is what prevents sticking.
  20. Sit, and hold the pot over your lap. Tap evenly around the pot near to the lid. Do not tap on the thinnest parts of the pot. If you're not successful, leave the pot for a few days and try again. Sometimes pouring hot water over it can help. Sometimes it lets go itself after a few years....
  21. From The New York Times:Mercury Is in Retrograde. Don’t Be Alarmed.Scientists will tell you it’s all an optical illusion and superstition. And even astrologers say it’s nothing to worry too much about.https://www.nytimes.com/2019/03/14/style/mercury-retrograde-facts.html
  22. Thanks, Mark. Looks like what we used to call Stoney, but with more variation. I'll compare formulas....
  23. @Pres, do you take the casters off the chair? I don't think I could throw sitting on a chair that wants to roll.
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