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Tyler Miller

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  1. are these engobes ?

    https://fr.wikipedia.org/wiki/Engobe
  2. cracking bottoms in the kiln

    I buy it pre-calcined from my supplier, but the studio I work at just has a bisque bowl they fill with epk and put in the bottom of their bisque loads.
  3. are these engobes ?

    @sputty you missed my use of an indefinite article. A word for slip, not the word. And actually, doing a little more digging, Min’s definition and the “American” definition seems to be common usage. Even in French.
  4. Raw ash onto wet clay

    Bjarni Sigurdsson is someone you may want to check out. Icelandic potter who uses volcanic ash in glazes and clay bodies. It’s a significant part of his artistic practice.
  5. Bisque Temp Problems

    It’s tough to say what you should do without more information. If you go ahead and just dip, they may not behave the same in the glaze firing. Rebisque isn’t the end of the world. Use cone packs in the future to know more info about your firings.
  6. Black speckles in porcelain - sand?

    The black speckle is an iron/manganese containing mineral of some kind. It does look very fine. Jonathan Walburg out of Wisconsin does a similar thing with lake Superior beach sand in porcelain. It’s a coarser effect, but he directly wedges sand into his porcelain. He’s a pretty good guy to talk to if you track down his pottery page on facebook. J pottery, I think.
  7. are these engobes ?

    Engobe is a French word for slip. Simple as that. Min’s answer is the most thorough as to the everday use of the word, though.
  8. Lithium replacement

    You’d probably get more lithium from eating shellfish regularly than a beloved mug or bowl. Edit: In all seriousness, though, something that tends to be lacking from these discussions about risk is an appreciation for the body of evidence and information that surrounds a perceived risk. There’s a concept used in medical science called the “pyramid of evidence” that people who wish to be informed about chemical risks should acquaint themselves with. You’ll notice that when I posted studies on topics like this, I tend to posts clouds of studies on these issues, this is to illustrate trends in these studies. This is because, taken individually, these studies are semi-useless and confirm nothing. Meta-analyses and systematic reviews of evidence are higher up on the pyramid and are where you should really be basing your decision making. if they don’t exist, you find all relevant studies and compile the evidence yourself. Unless that’s happening, it’s just cherry picked confirmation bias.
  9. Question on mixing colorant batches

    @neilestrick I’m sorry, my wording wasn’t so precise. I meant more that working volumetrically isn’t an issue, can be precise, and that it isn’t a big ask to do what the OP intended because the knowledge base is there. And I do believe the curry grid gents who possess that knowledge have obliged in figuring out what needs to be done.
  10. Question on mixing colorant batches

    It should work, as long as your math is right. There are a few reasons why working wet can be desirable, even. Dry mixing glazes being a messy job is the main one. In certain parts of the world, working with wet ingredients is the norm and glaze recipes are measured volumetrically. It’s just what you’re used to and comfortable with. If I’m not mistaken a member mixes line blends/curry grids at least semi-wet? As long as your math is right, your base glaze well mixed (so it’s the same SG all the way through) and your scale accurate, it should work fine.
  11. Graphene & Ceramics

    Graphene is combustible, being carbon.
  12. I built mine in conjunction with a machine shop. 3/8” piece of square mild plate with 1” round bar stock welded to it. I cut the wooden parts and mounted bearings in the wheel head and kick wheel base. Took a weekend of labour and $200 CAD. One of those things you sortof have to make yourself. And sorta rightly so. It’s a very simple wheel.
  13. Moulds for Slip casting

    Bisque molds were/are used all the time—with a history back to bronze age Crete in Europe. I’ve worked at a not-for-profit recently where they used bisque molds instead of plaster because bisque was a little more robust and easier to replace if broken. Plaster is preferrable, but bisque molds have been used for literally thousands of years.
  14. Black Iron Oxide

    Black Iron oxide is FeO in glaze chem, Fe3O4 in the bag. Hamada expressed a preference for blacksmith scale and that is proper FeO. Hematite: Fe2O3 Wustite: FeO Magnetite: FeO.Fe2O3/ Fe3O4 — a crystal (spinel) of FeO and Fe2O3. Metallic iron is just Fe. Yellow iron oxide: FeO(OH).nH2O
  15. Gold’s pretty inert stuff. The chems used to suspend the gold for application are pretty horrific, and the gasses they release during firing are bad, but the gold itself is harmless. There’s nothing in the body to interact with the gold. Passes straight through you. Luxury foods are regularly gilded. Silver isn’t harmless, but it’s pretty low on the toxicity level. In high enough doses for long enough, you’ll turn silver yourself, a condition called argyria. Link: https://en.wikipedia.org/wiki/Argyria Edit: I shoukd say, the compounds used to make “silver” the colour are not always so safe. Bismuth, manganese, etc.—esp in raku.
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