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Celia UK

Member Since 01 Jul 2012
Offline Last Active Today, 07:26 AM

Posts I've Made

In Topic: Mixed My A First Batch Of Glaze

27 July 2016 - 04:29 PM

Go team OldPug  :D Keep mixing and melting those rocks Pugaboo.
Celia it probably costs more for lowfire glaze ingredients but I can get a 10kg glaze bucket for £8-12 using raw materials when it is £40 and up for premixed. I think cone 10 is cheaper on ingredients but it sound strange that you can't make it for less.

Think I must have opted for a complex recipe to do my comparison exercise. Will look for another recipe and go through the exercise again!

In Topic: Mixed My A First Batch Of Glaze

26 July 2016 - 09:53 AM

Good luck! At least you can get on with it without having to wait until you have a kiln load to fire.

In Topic: Replace Frit 3134 With Gerstly Borate

26 July 2016 - 08:40 AM

I've had FF3134 in the past, (it's not so readily available in the UK)  but I now tend to use Standard Borax Frit as a substitute - no disasters so far.

CTM Potters do FF3134 Ayjay, but their Standard Borax Frit is about half the price.

In Topic: Mixed My A First Batch Of Glaze

26 July 2016 - 08:32 AM

You will save so much money making your own glazes,  it will give you great satisfaction.  Every once in a while I will buy a premixed glaze because the sample is interesting,  I am usually disappointed.  The glazes I make are much more reliable.    Denice

I always thought mixing my own glaze would save money Denice - until I costed it out and even a basic low fire transparent was barely cheaper AND I calculated the costs proportionately to the quantity in the recipe! The only advantage I could see is if anything goes wrong, you do at least know the glaze ingredients and might be able to adjust the recipe.
ALSO my experience of a premixed transparent is contrary to yours - I have one that is virtually foolproof and totally forgiving of any poor application techniques. If I could find a recipe that achieved the same success I'd go for mixing my own again, but I'm still looking. At least, having gone through the exercise of costing out a recipe I now know which ingredients are the expensive ones and which the cheaper ones!

In Topic: Substitute For Lead Bisilicate

07 July 2016 - 03:21 PM

[What temperature do you fire to, so I can be a bit more specific?
Are you against lead because of risks to yourself?
If you are doing functional ware then you can keep the lead out of the area in contact with food - e.g. on the outside of jugs - and use a lead free glaze inside. Or, so long as you don't use copper, you can make food safe lead free glazes - you can get the same lead leaching test kits on eBay that the FDA field workers in the US use (I forget the name, the seller is somewhere round Poole), or if you do a lot it is only about £40 to get a test house to do a more accurate and official test for you.[/quote]

Thanks Tim - glaze firing to around 1100oC. I appreciate that I can keep the lead glaze to the exterior, but I do like copper!!! I'll look for the leaching test kit - worth knowing about thank you! I've been to the ceramics suppliers today and talked this lead issue through with various technicians - then priced up the ingredients cost and there was little savings to be had over buying one of their glaze mixes! The only benefit seems to be that you know the exact contents if you mix your own, which is helpful if things don't turn out well and you're then trying to troubleshoot.

Sputty - don't think I'll need to worry about EU regulations - one of the few benefits of being 'out'!!! I'm going to try an alternative recipe that Gerry at Potterycrafts suggested (using ingredients I already have) and see how I go! Re AP - the recipe above was from a glaze workshop I did with John Masterson (AP Chairman), who, along with most others I've spoken to would similarly not be overly concerned if used on outside of ware and suggested testing if I wanted to seek reassurance. Interesting comment about endocrine disrupters - especially as one ceramic supplier expert tells me that Lead bisilicate has been removed from the list of toxic substances - can't remember the name, but it no longer bears the skull & crossbones symbol, but food standards have apparently yet to catch up. I expect that will promote a flurry of posts here!