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About GreyBird

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    Advanced Member

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  • Location
    Croton on Hudson, NY
  • Interests
    Clay, Parrots

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  1. OK, looks fabulous on the squid vase... and a second Hudson River clay glaze recipe on a few other pieces... It's been almost a year since I started down this rabbit hole. I think I can lay these to rest now and get back to production!
  2. OK, well it's 7PM and it's only at 400°. I guess this is going to have to wait until tomorrow morning.
  3. I'm tracking temps in my latest firing. I have an old Norman Electric Kiln. I found I needed to slow the heat rise in the last portion of the firing but It cooled steadily at 100° per hour which is plenty slow and that's with kiln vent on. At that rate it should have been cooled to 300° by 2pm today but it seams to have stalled at 11am around 700° since at 1pm it was still at 700°. I opened the vent and still it only dropped 50° in the next half hour to 650° so I also cracked the lid and we're down another 50° in a half hour. I'll check it again in an hour but as it cools the cool down real
  4. So do think the orange color on the plain clay part is coming from some sort of soda ash or baking soda in the glaze?
  5. Yes! Go to Croton Point, park in the big parking lot facing the playground. Walk in past the playground parallel to the river. You'll be walking South. When you come to the end of the field you'll see a path/dirt road that goes up and to the left a bit. Follow that up about 100 yards and you'll see a path on your right which leads down to the river. Now just keep walking South along the river and look to your left. There are many places where trees have fallen over and you can see the clay entangled in their roots. Also where the walls of the river get steep and high you will see clay there. Y
  6. Its funny how things work out sometimes... I had posted a photo from a book a while back which pictured a "rust red"platter. I had to take the photo down as it was copyrighted, but the discussion talked a lot about obtaining the red I was looking for that I saw on that platter. I had given up on the idea after many failed tests. And subsequently moved on to develop the Hudson River Clay glaze. The last tile I pictured here in this post showed some really great rust red blooming from the dark glaze. I fired that in my test kiln and matched the heat rise and fall of my large kiln, or so I though
  7. Oh boy, good to know. Thanks! And thanks for the video!
  8. Don't the numbers along the top of the chart represent cones? so, 02, 01, 1, 2, 3 etc.? If this is true then simply adding more Silica to a Matt glaze not only makes it glossy but should also move it's firing temp up? Unless I misunderstood those numbers along the top of Matt Katz's chart. Your chart just says cone 10 along the top and does away with those numbers.
  9. Hmmm, very interesting Bill, I never even thought to look at it using the glaze software. And here I just learned so much about glaze chemistry, I should have. I just assumed, since it was in a book, it would be correct. I'm looking at it now... doesn't the ratio: Si:Al: 4.7:1 put it firmly in the Stull chart as melting at cone 6 as a Semi Matt Glaze?
  10. So I brought my favorite glaze into class to show my teacher what I was going to do color tests on. Keep in mind she is not a glaze chemistry teacher but she is a very good at teaching throwing & hand building. She quickly pointed out that my favorite tile is full of pinholes. I was astonished. I could not see them at all. I actually thought she was pulling my chain but she was insistent and kept pointing and looking real close and saying "yup, they're there." I kind of wanted to poke her in the eye. I did not. After class, I went home and got my magnifying glass and a flashlight and did a
  11. OK, I think I just can't give up the experimenting bug. So now I'm thinking what colorants will work well with this glaze? I am going to try what is used for Waterfall Brown in "Mastering Cone 6 glazes". It makes a lot of sense since this clay has such a high Iron content and waterfall brown utilizes that. So I'll add 3% Red Iron Ox since the clay already has 7% and 1% Rutile. Should be fun! Hmmm, also I wonder what would happen if I added Opacifiers. Maybe I need to do a triaxial blend with it
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