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Magpie

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  1. Great, this has been very informative. I didn't know what I was getting started but I'm glad I did.
  2. Hi dprjessie, I had this same question and I emailed Amaco a while back. They emailed me back and indicated that you could turn the brushing glaze into a dipping glaze...they sent me the following instructions. AMACO SUSPENDAID AP – NON-TOXIC Suspendaid is an anti-settling additive. It is used to change a brushing glaze to a closer workability of a dipping glaze. To do that you should disregard the brushing glaze directions on the label and follow the following general directions. 1) Pint (16 oz) Directions: A) Take out 4 oz. of glaze from the pint jar. Add 4 oz. of water and 1 tablespoon of Suspendaid. Mix thoroughly before using for dipping. 2) Gallon Directions: A) Take 2 pints of glaze from gallon jar. Add 1 and ½ pints of water and 6 oz. of Suspendaid. Mix thoroughly before using for dipping. 3) Dry 1 lb Directions: A) Add 1 pint (16 oz.) of water to 1 lb. dry glaze. Add 2 and ½ tablespoon (1 oz.) of Suspendaid. Mix thoroughly before using for dipping. Glazes vary in viscosity, therefore if you feel that your dipping glaze needs to be thinner, add a little more water. If your glaze settles, then add a little more Suspendaid. With practice you will learn how much water and Suspendaid needs to be added for the dipping glaze consistency that you like. I purchased a gallon of albany slip brown and a gallon of blue rutile. I am an avid glaze stir-er so I didn't think the Suspendaid was necessary. So, I just thinned the brushing glaze with water using the amount of water in the instructions as a guideline. My kiln is cooling right now...so I'll post the results once it's cool.
  3. So, the trina buff clay should have been vitrified at cone 6. Pinging pots aside, the only reason that water would seep through would be that the fired clay body was not holding water (possibly under-fired)? I know that stoneware for functional use should be 3% with the goal of being closer to 0. But even at 3%, will pots seep liquid? Would they be microwave/dishwasher safe?
  4. Thanks for all the responses. I've done a lot of reading about clay bodies over the past few weeks. So, from what I've read, the clay manufacturers give a wide range of firing temps which may not be completely valid. I was throwing trina buff, a cone 6-10 clay. It's not that this clay can't be fired in that range but that cone 6 is at the low end of the range. Also from reading, I've learned that each clay body has a specific temperature at which it vitrifies. So, firing trina buff to cone 6 may not get it to a cone where it completely vitrifies. The recommendation that I read said that you should choose a glaze you like, say a cone 6 glaze, and then pick a clay body with that cone at the high end of the firing range. So in this example, I would pick a mid-fire stoneware with a range of cone 4-6. This seems to make since to me...any thought on this? So I was thinking for the next firing I will try a cone 4-6 clay with the same glazes and see what happens. I'll also add in a few naked peices to test for absorption. And, some cones to test my controller.
  5. The pots don't seem to be crazing...at least visually I can't see it. I read to fill the pots with water and put them on a dry surface to see what happens. I did that and a few of the pots are seeping water. Which, leads me to believe that there are small cracks in the glaze. So, what does that mean? Besides a damp table, are my pots not functional? I've read differing opinions on this.
  6. Hello, I recently set up a small home studio and this weekend was my first glaze firing. I didn't rush...did a slow galze fire to cone 6 (with an L&L pre-programed firing schedule) and let is cool for 24 hours. The pots were just barily warm when I took them out of the kiln. I used trina buff clay from Highwater (rated for cone 6-10) and Amaco Potter's Choice glazes (rated for cone 5/6). The pots look nice but they are "pinging" a little (these are functional pieces...mugs, bowls, etc.). No cracks are visible. Is this normal? My previous throwing experience has been in teaching studios were students do not load or unload the kiln or having anything to do with firings. So before, I would glaze a pot, put it on the shelf, and pick it up in a week. So, I've never heard the "pinging" before. Thanks for your thoughts!
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