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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Yesterday, 08:25 PM

#124245 What Might This Be?

Posted by High Bridge Pottery on Yesterday, 08:49 AM

I would make a guess at some sort of englobe (slip) too. Doesn't look like a glaze

#124058 Colemanite

Posted by High Bridge Pottery on 20 March 2017 - 08:50 AM

I remember doing a bit of research into this after trying colemanite and it jumping off every pot. The only temperature I can find is 800c for getting rid of the chemical water. No idea if it will still be a powder after but melting temps seem around 1000~. Maybe you could just slow down a glaze firing through there.


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Digital fire also talks about the possibility of gypsum impurities.


You could melt a load into your own frit  B)

#123764 Tea Pots

Posted by High Bridge Pottery on 15 March 2017 - 08:27 AM

I always thought they were small to catch most of the loose leaf tea on the way out.

#123299 Qotw: Are You Afraid Of The White Gold?

Posted by High Bridge Pottery on 06 March 2017 - 05:53 AM

I count porcelain as more of a glaze you can throw rather than a clay that vitrifies.


I have tried once or twice and thought how horrible it was. Like when I drink a cup of tea and I am sad it's not coffee....

#123140 A Couple Of Odd Things That Occured In My Bisque Firing

Posted by High Bridge Pottery on 02 March 2017 - 06:09 PM

Why is the rim shiny?

#122447 Adding A Touch Of Gerstley Borate?

Posted by High Bridge Pottery on 17 February 2017 - 04:37 PM

Adding 10% GB may just make your glazes glossier and a bit more fluid. Here is a test tile I did using only GB as the flux. Going up increases in Kaolin and to the right increases in Silica. There's a certain point that you get some depth with 'boron clouding'. I remember it being related to how much silica is in the recipe too. Cone10.


Do you have any rutile/titanium/tin? Have you tried layering glazes?



#122307 Home Made Kiln Controller

Posted by High Bridge Pottery on 14 February 2017 - 05:02 PM

It has been a while since I got to dabble with electronics. Looking into automating a gas kiln. Found a ball valve + actuator that needs 0-10v signal sent for how open it is. After some googling I found this op-amp circuit for doing that exact job so set about making it.




Took me a few failed attemps (wired the 24v positive up from actuator up to my raspberry pi and killed it, same with chip) but once I made sure it was the right circuit it all works perfectly.

Realised I never posted the MAX31855 circuit so here is that one too.




Tested it out on the kiln today and it works a treat. Still lots more work for actually programming the thing to do sensible things.





#122237 Clay In Glazes.

Posted by High Bridge Pottery on 13 February 2017 - 01:46 PM

If you make glazes thixotropic with vinegar they can 'go solid' before any drips form. Also found this can make glaze crack off the pot if you add too much. 

#122069 Ok To Wash Clay Clothes In Washing Machine?

Posted by High Bridge Pottery on 10 February 2017 - 04:36 PM

I haven't had any issues putting clothes covered in clay straight in the washing machine.

#121571 Firing Earthenware Jugs - Basic Questions

Posted by High Bridge Pottery on 02 February 2017 - 08:34 AM

If you have some kiln element you can make your own stilts. Cut off little 'stilts' from the elements, stick them into a clay base and bisque. Job done. 


Have you tried firing some earthenware to cone6 yet to see if they hold up/vitrify at cone6?

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#119681 Ian Currie Test Tiles Forums?

Posted by High Bridge Pottery on 02 January 2017 - 04:36 PM

For 6 months my brain has been empty but somebody just poured glaze into my ears :blink:.



#119324 Raw Glazing At Cone 6-8?

Posted by High Bridge Pottery on 28 December 2016 - 04:07 PM

I was having a look at John Brit High Fire book today and it has a little section in there about single fire if you have the book. It did say that high clay content is needed for leather hard glazing but most glazes could work on bone dry pots as they have done the shrinking.

Never tried it myself.

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#119323 Silica In Glaze And Body To Ensure Good Fit?

Posted by High Bridge Pottery on 28 December 2016 - 03:59 PM

Where can I find the jello coated cookies?

#118503 Qotw: What Are The Top Five Things In Your Studio That You Would Not Part Wit...

Posted by High Bridge Pottery on 15 December 2016 - 05:26 PM

I had to move out my studio not so long ago. Looking around my bedroom I can see many more than 5 items that I couldn't part with and a studio of 0 size  :ph34r:

#118116 Community Challenge #8

Posted by High Bridge Pottery on 08 December 2016 - 04:40 PM

Soooo.. Again not doing so well with the ideas. Looks like my brain is AWOL in that area. 


I have removed my half baked rambling poetry and added a challenge submitted to the ideas thread.


Note to self, do more thinking.