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  1. Is there any scientific way of measure the plasticity and tell it in numbers ? I know the easy way by rolling out a coil and wrap around the fingers to check the plasticity in no time but I wanted to know is there any way that I can measure it and keep noted so that it can be a reference is future ...
  2. Tom, The colour in the foot ring is because of the carbon coring or its because of the sulphides which causes the colour ? Also we are using the same ball clay for our glaze as well but i dont know this particular glaze has ball clay in it., And even if its because of the sulphides and carbon wi is it not happening with all the glazes happening with only the particular glaze ?
  3. Yes, I ll cut down the soak to 15mins and see hows its coming., Yes the glaze application is thick as well and does the thick application cause these kind of craters and bilsters ?
  4. We are using the hold for the glaze to even out and the body to mature well.
  5. Min, Here is the chemical of the ball clay which we are using.
  6. But Tom, We are not adding any red clay (Laterite) to our receipe, but still its pinholing and blistering...
  7. I have this heavy blisters and pinholes issue and I m doing the Bisque at cone 08 and glaze temperature is at cone 6 + 40 mins soak., Whats the reason behind this blisters and pinholes ? Is it a clay issue or its something to do with a glaze chemistry ?
  8. Babs, I have been try using the synthetic plasticiser to the clay and can share you the results once the clay is ready.
  9. Babs, The crack is happening in the mold itself but it not a end to end crack and its a surface cracks but bit deeper than the usual surface cracks.
  10. Rae, yes we have try adding 5-20% grog to the body but still the cracks are happening in the same area. :-(
  11. Hi, We have been doing the jigger for the first time and the pieces whatever we are making have a cracks in a same pattern in a same location, and we are using Terracotta clay to make the pieces and here I m attaching the cross sectional pieces of the molds., and in the molds I have few doubts and I would like to get clarified so that I can reduce the cracking doors one by one., Does the thick and thin portions of the molds absorbs water differently so that the pieces are cracking ? As you can see the picture of the pieces the cracks are happening in the place where the sid
  12. Tom, Pls find the attached picture of the clay which we are blending and using., These are the two red clays which we are getting from our supplier No.1 Red one seems like the laterite or red soil after I read the article of Dr. sudharsans article abstract and the No.2 seems like more of an alluvial soil I guess so, and we used to get the No.2 most of the time becasue it used to be very good interms of plasticity and there wont be any cracking as well but the No.2 Mines clay is not easily available I can get the material only at the time of summer because the mines will be closed at t
  13. Curt, Thanks for your reply, and the top picture is our regular terracotta which is been throwing on the wheel.
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