Jump to content


  • Content count

  • Joined

  • Last visited

About jafa5

  • Rank

Recent Profile Visitors

80 profile views
  1. Lithium replacement

    Very informative discussion thanks guys, seems the glaze i'm using is pretty good and my general concerns are minimal which is great! Time for some glazing!
  2. Lithium replacement

    Thanks Douglas, point noted and copper is in
  3. Lithium replacement

    Beauty thanks Min You're a star!
  4. Lithium replacement

    Thanks Min I have a couple of gas kilns and can go higher but starting with low fire and working my way up. Quite fortunate to be working on a construction site for a motorway and getting access to a heap of raw materials from volcanic ash, basalt, feldspar and other rock types, most of which are going to be high fire and no doubt i'lvl have a heap of questions when I get started on that in July. Thanks for checking the recipe and nice to know it's balanced for cone 04 to 06. I started to look at Insight and it's going to take some time to learn that but a great looking tool. Longer time to understand all the materials and effects of course, few years to get the basics I think. Do you think the lithium would pose any issues for food safety? I'd really like to use it on the inside of some of my cup forms.
  5. Lithium replacement

    Thanks Min that's really helpful, might take me a few reads to soak it all in but some very clear points thank you. I'll Firing for this is cone 04 to 06 if that makes a difference. I'll load Insight and have a play with this recipe and look to increase the Silica and alumina while reducing boron and removing lithium altogether. That'll be a fun excercise
  6. Lithium replacement

    Awesome thanks Marcia! I didn't see that, checked DF before I posted this too. The video is replacing lithium carbonate with lithium frit, so only replaces lithium with lithium. I was really after a less toxic material, maybe another alkali earth? Maybe i'lol just omit it from the recipe and see how that turns out. What's the worst that can happen
  7. Mixing Glazes

    Hey sgagnard, New potter here too. I havn't bought any glazes yet but making my own or making up given recipes. For my initial tests I make 100ml (metric sorry and not sure on conversion) which is enough for few small cup forms to test in different parts of the kiln. If it's good I make up 1 or 2kg batches which is enough to dip easily. I mostly use that batch size because I have a number of 4 litre plastic pales from the local bakery, so convenient. It also means I don't have too much of a single glaze. Downfall is that you have to mix it more often which can be time consuming when you want to fire them now. If you know you like the glaze and have the storage capacity, I'd buy bulk and save some money, then mix as much as you can fit into your pales. Really nice to have it ready to go and only need a mix up. I'm making bigger batches of a few base glazes that I can mix and draw off a litre to make additions with oxides or stains. Working well for me anyway. Cheers, Liam
  8. I'm using Woody Hughes base glaze (below) which has 4% lithium carbonate (from CM Guide to Materials). i'd like to replace the lithium with something that's food safe, or safer but retain similar qualities to the glaze. The glaze turns out amazing in the gas kiln, especially the copper variant. Although i'm not sure about the copper for food safety either so i'm keeping that on the outside of sake cups. Any feed back on copper use would be appreciated. New potter of 6 months and still learning, so if this sounds like a newbie question, there's the reason. I understand that if the glaze is stable, lithium should be food safe at 4% but i'd like to remove it to be sure. My firings are not consistent yet as i'm still learning the kilns hot cold spots. Hopefully any feedback might give me a better understanding of what lithium adds and what a counterpart would add. Digital fire is an amazing resource but i'm new to chemistry so hard to follow or understand the implications / effects. Another 10 years I'll be able to answer some questions in return hopefully practical applications will bolster my progress! The glaze characters I like are that it doesn't run, the copper is beautifully transparent and highlights the clay body plus it doesn't crackle even with a fast cool down. Faro fritter 3124 30 Gerstly borate 26 Nepheline synite 20 Kaolin 10 Silica 10 Lithium carbonate 4 Addition - low firing to 1050 degree c Any adevice would be greatly appreciated. Cheers, Liam

Important Information

By using this site, you agree to our Terms of Use.