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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Yesterday, 04:02 PM

#111534 Struggling To Get A High Gloss Cone 10 Transparent Base. What I've Tried...

Posted by High Bridge Pottery on 17 August 2016 - 01:54 PM

You're welcome, it is from Newcastle College ceramic department. Not sure who came up with it. Do you have some pictures of the tests? 6% seems like quite a bit and will be changing the glaze chemistry as you can see. Could be if you are colouring the glaze with that much stain each one could need a slightly different recipe to have the right surface.


Have you tried using it to colour slip or paint on as underglaze and using a transparent over that? It could help the problem but maybe lose what you are looking for in colour.

#111460 Making A Glaze More Runny

Posted by High Bridge Pottery on 16 August 2016 - 10:43 AM

Just about to say that myself Fred :D Interesting book, look for second hand books as I bought one for 1/10th of the new price.




I have not seen high calcium make a glaze very fluid except in weird situations where something crystallizes out my glaze and then makes it very fluid in that area. Still dropping the alumina will get you closer and increasing the calcium may help it along.

#111024 Qotw: Clay Poem Anybody?

Posted by High Bridge Pottery on 05 August 2016 - 04:56 PM

The slip.


The slip slop

did drip drop

and tipple top

until you stop

the pouring.

#110958 Qotw: Clay Poem Anybody?

Posted by High Bridge Pottery on 04 August 2016 - 01:56 PM


Taking the rockery.

Melting so hot you see.

Or not.

As fiery light so bright.

You can't see your pottery.

#110659 Qotw: Are Our Expectations Too High?

Posted by High Bridge Pottery on 27 July 2016 - 03:46 PM

I like peoples big aspirations and dreams but if you can't deal with failure then you quickly find pottery is not for you. No problem with people being naive and expecting to make great things before they have learnt anything.


I disagree about the internet or young people being the problem these days and the search for instant gratification has always been a human instinct. It has been played on by consumerism and advertising for much longer than the internet.  

#110556 Replace Frit 3134 With Gerstly Borate

Posted by High Bridge Pottery on 26 July 2016 - 03:02 AM

GB seems to change half the sodium flux for magnesium and comes with less silica.


You could mix in a bit of feldspar but then your alumina will be shooting up and alter the recipe. The best match may be to use GB with a little extra silica and ignore the changing of sodium for magnesium. Depending what else is in the recipe you could get a little closer swap.


Something like 1 frit 3134 = 0.77gb + 0.23 silica



#110294 Your Refractory Is Toast

Posted by High Bridge Pottery on 19 July 2016 - 07:47 AM

This video popped up in my subscription box and I thought it would be worth sharing on here. Haven't been able to find much about it's operating temperature or how long something like this would last but it sure is interesting making some refractory carbon out of bread. Seems like a bit of a strange one as in my head the carbon should burn away but maybe the reduction firing first changes something about the carbon.


Very crude ideas in the video but nothing like trying it out for yourself. 


Bread kilns here I come :D


#110259 Relay / Magnetic Contactor Question

Posted by High Bridge Pottery on 18 July 2016 - 01:13 PM

Pretty good company, had a few chats with their people. Sure they will get you sorted out.

#109670 Ceramics Basics - Help!

Posted by High Bridge Pottery on 01 July 2016 - 03:14 PM

This explains it pretty well, firing ceramics is about transferring heat into the pots so takes time. Take note of the heating rate oc/h last 100 of firing.



#109433 Stilt Mark Question

Posted by High Bridge Pottery on 26 June 2016 - 01:58 PM

I think you probably got the right answer. Not the right bit. Not something I have done though but I think you need to polish it.

#109274 Bubbles/craters All Over

Posted by High Bridge Pottery on 23 June 2016 - 02:41 PM

The glaze besides where it has cratered doesn't look bad. Makes me think it is the clay, not too complicated to try a different bisque firing or even rebisque your pots and glaze to see if that improves anything.

  • oly likes this

#109269 Crazing - Commercial Glaze

Posted by High Bridge Pottery on 23 June 2016 - 02:04 PM

Pottery is the art of putting a lot of time into failing.


You could add silica to try and lower the expansion of your glaze or some clay. 

#109198 Qotw: What Is Your Biggest Safety Fault?

Posted by High Bridge Pottery on 22 June 2016 - 01:08 PM

I am always a bit too lax with the electrical juice out the wall. Ran a 32amp kiln on 30amp breaker for 3 years although it was fired infrequently. Had relays get stuck on for 12 hours and wires melting during firings.


Took a knife to a wire still plugged in and turned on, learnt my lesson. 

#108601 Qotw: What Would Be The Title Of A Clay Book Of Yours?

Posted by High Bridge Pottery on 12 June 2016 - 03:17 PM

I would like a book, The complete encyclopedia of glaze tests.

#108414 Qotw: What Would Be The Title Of A Clay Book Of Yours?

Posted by High Bridge Pottery on 08 June 2016 - 02:14 PM

Journey from the centre of the earth.

A potter's tale.




Now if somebody could write it as I am terrible with words that would be grand.