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ISY

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Everything posted by ISY

  1. Hi, I'm wondering if anyone has any thoughts on this effect: website is here: http://www.mostra-moustiers.com/fr/galerie-la-mostra/aire-goutt-allikmets.php Is this a look achieved through a glaze that cracks/crazes excessively, or what else is happening here?! I've seen a few vessels with this type of effect recently and I think it looks great, but how exactly is it done?!
  2. ISY

    Glaze or clay effect?!

    That's a good point. I think I'll definitely stick to my trusty hairdryer if I experiment to try to achieve this glaze effect!
  3. ISY

    Glaze or clay effect?!

    May have to work on my Estonian, it's a little rusty... German I could do (I'm from Germany, though living in the UK), but that's about it! I may send her an email - you are probably right, why have your email out there if you don't like getting emails. And the worst that could happen is that she says 'no'. Re. your unfriendly potter, that really is quite off-putting, and I suppose it's fairly close to my 'worst-case-scenario' idea which usually prevents me from contacting potters directly with questions. In person, the few potters I have met I have found to be a helpful and friendly lot who welcome newcomers with advice and generosity, so hopefully this is generally the case and stories such as your encounter in Lyon are rare.
  4. ISY

    Glaze or clay effect?!

    My French is, alas, pretty rusty, but I managed to copy it over into an online translator and got the gist of it (I think). The technique sounds pretty similar to what Min and Magnolia Mud Research have said. I suppose I could contact her... I'm always a bit worried about bothering people directly, as I imagine they don't want to be pestered, but I admit I'm probably overly hesitant with things like that.
  5. ISY

    Glaze or clay effect?!

    That's such a good idea. I wonder if this would work more generally with glazes that lend themselves to green ware? I've not experimented with single firing at all, though the idea really appeals.
  6. ISY

    Glaze or clay effect?!

    That is really interesting, would love to try that. I wonder if a good old-fashioned hairdryerinstead of the heat gun might suffice...
  7. I have a tin white that looks like that if fired over darker clay bodies. It breaks at the edges and also produces these speckles. It's a pretty effect, although I was initially annoyed as I'd been on the look-out for a glaze that would cover more uniformly.
  8. Hi, does anyone have any advice on how to ensure a glaze is food safe and doesn't leach anything harmful? I know that it's possible to send samples off to get tested, but for a hobby potter this is not too useful since even if I know that one batch is OK, I can't adequately ensure that I'll meet exactly the same conditions for a subsequent batch and I can't keep sending stuff off for testing, it would get too expensive. So far I've just avoided the problem by only making ornamental ware, but it would be quite nice to make a few mugs that could be used at home. Are there any glazes that simply don't have anything harmful in them, so that even if they leach they are not going to make anyone ill?!
  9. ISY

    Food safety in glazes

    I'm currently firing to cone 8 but also plan to occasionally fire cone 6. Sorry, I probably am overthinking this! So I just apply the liner over the glaze I want to use on the interior, then apply glaze as wanted on the exterior (but without additional liner), and then fire to temp?
  10. ISY

    Food safety in glazes

    I'll try that, thanks. I have a very basic transparent glaze that I bought rather than mixed myself so I'll check what ingredients it has. Being transparent it's hopefully going to be OK. So would I just use my normal glaze, then add a 2nd layer with the transparent glaze? Or do I double-fire, once at a lower temp for the 'questionable' glaze, and then again at a higher temp with the transparent glaze? Thanks for all the help and advice, I appreciate it.
  11. ISY

    Food safety in glazes

    That's great, thanks!
  12. Thanks both, that is really helpful. I'll try that for my next firing (which will be a cone 8) and see if I can get it right.
  13. Hi, I'm still fairly inexperienced and used to always fire my pottery at a studio where I went to classes etc, so the adventure of firing in my own kiln is still pretty new to me. I was given an old electric kiln, which is now connected and running, any dangling heating coils were fixed, and the whole thing was given a once-over by a kiln engineer. The kiln has an electric controller and I've set a number of different programmes (biscuit, cone 6, cone 8, etc). I've done a few firings so far, 3 biscuit firings and one glaze firing to cone 8. While none of the firings have gone wrong and everything seems to be working fine, I noticed that despite the temp controller there seem to be fluctuations in the temperature. I was using orton cones to check the kiln was firing up to temp and I find that for a biscuit firing it consistently seems to fire to slightly below temp (so first cone will just start to dip rather than lying flat, the other two are not touched). For the higher glaze firing the opposite seemed to be true - when I checked all the cones had dipped - the first two had completely keeled over, the last one (for the highest temp) was about half-way. I realise that these are fairly minor temp fluctuations, but is this a normal thing? I imagine with glaze firings it could make all the difference? Could outside temp account for it? The kiln is in a shed so in winter it does get pretty cold.
  14. ISY

    Food safety in glazes

    Related question to all you knowledgeable folks - I know that manganese can be a problem, and I am not using it for anything food related and am also careful not to spend time around the kiln when firing. However, if I have a decorative item that is definitely never going to be used for food, that is fired with just manganese (sponged on, I really like the look of that), would this pose a problem if the item was occasionally handled? Nobody is going to lick it, or anything, but could toxic substances be absorbed through the skin for example? Thanks.
  15. ISY

    Food safety in glazes

    Min and Mark C., I had assumed that if I use for example a transparent glaze over the top of another glaze they would blend/melt together in the firing process? I can see I have a lot to learn about glaze chemistry. It was never my strongest subject at school, so it's going to be a bit of an adventure I think... Is there any definite list of glaze ingredients and toxidity that I could refer to? As it is I'm going with the label on the bags the stuff came in but while it does say if something is really toxic (Nickel comes to mind, which has a reassuring little skull on it!), but it would be useful to have a list for less toxic materials that might still be moderately harmful if they leached out of a glaze. I don't think I'd ever attempt to drink out of something glazed with a Barium glaze, but there are so many glaze materials that I just don't know well enough to be sure.
  16. ISY

    Food safety in glazes

    Thank you so much for those links! I'd actually looked at that book on Amazon a little while ago because I saw it recommended, but the price tag of over £200 was a little off-putting. I'll see if it's a bit more affordable directly from the authors.
  17. ISY

    Food safety in glazes

    Thanks Neil and Pres, I had just assumed that I couldn't re-create conditions adequately well to have comparable batches. My kiln is also still a bit temperamental, but I'm hoping to get that sorted as soon as I can. So maybe this isn't a totally unachievable thing for me after all! Thank you also Pres, for the suggestions re. mixing glazes, I really like the erasable marker idea, going to try that.
  18. ISY

    Food safety in glazes

    That is great, thanks! Lots of info on there!
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