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High Bridge Pottery

Member Since 19 Feb 2013
Offline Last Active Today, 07:15 PM

Topics I've Started

Making Sodium Silicate.

07 November 2015 - 08:36 AM

So I need some sodium silicate and I happened across somebody making it from oven cleaner (sodium hydroxide) and silica gel.


Has anybody ever tried this out before? Going to look into it a bit more but it seems a lot cheaper than buying it. Seems like an interesting material I don't know much about.

Community Challenge #4

02 November 2015 - 10:08 AM



Welcome to the community challenge #4

This is a place where we can challenge ourselves alongside other community members to create ceramic works within the constraints set out in each challenge.
The Challenge
This challenge is to make a hydria.
The Rules

  • Everybody can enter the challenge, all you need is a registered account on the forum.
  • Work in progress (WIP) images are encouraged. It can help to talk through your research and ideas but please don't spam the topic. Keep the updates informative and succinct.
  • One final entry per community member, images no larger than 1024 pixels wide/high.
  • Attach images to your final entry post along with the text Final Entry - Forum Name
  • This will make sure you are not missed out of the results thread. Also make sure you post your final entry in this thread to be entered into the challenge.
  • The challenge will run quarterly and will be
    • 1st February to 29th April, 
    • 1st May to 30st July, 
    • 1st August to 30st October, 
    • 1st November to 30st January.
  • The results thread will be posted on the last day of the ending month. It will be a collection of all the entries into one post for condensed viewing and some post challenge discussion.

The Rest
Remember you are entering for your own enjoyment and there could be a risk that your work develops into something new and exciting.
Be considerate of others and don't post opinions without good reasons to back them up. We are all here to improve and progress with our ceramics.
Some dates may vary slightly as this is a community run project and it will depend on members having access to the forum.
Have any ideas for a challenge? Post them in the ideas thread http://community.cer...hallenge-ideas/

Community Challenge #3 - Results

01 November 2015 - 09:07 AM

This challenge was to make "anything but round". Here are the results  :D


Diesel Clay





High Bridge Pottery










Evelyne Schoenmann











Bubble Bubble Toil And Trouble

23 October 2015 - 04:42 PM





As you may know I have been spending time tweaking firing cycles to get rid of glaze bubbles. I thought it was the whiting and dolomite gassing too much. Bought some wollastonite in the hope this would remove the problem.

Here is the whiting dolomite glaze.



The wollastonite glaze



Now, they really don't look that different. Do glazes always bubble if they are thick? I would think no but unsure on that. Could it be my bisque? Go about 100degC per hour to 980. 

Funny thing is I happened to be doing a cone 6 instead of 9 firing for somebody else so put a few tests in to see what happened with a hold at 830degC I think.



Maybe this is not a fair comparison as application is different. Still bubbles there and probably less because of thickness.


Here is a firing with controlled cool to see if bubbles went.



Also tried adding 10% more of different fluxes, that didn't change anything either.


Should I give up and live with slight bubbles in the glaze? Is it even possible to get rid of them? When fired thin on a tile they are far less noticeable but I want to have a nice thick layer of glass bubble free. 

Specific Gravity To Calculate Dry Weight.

13 October 2015 - 12:27 PM

Can somebody please check my maths :D Seem to think about this for a long time and keep getting confused.


If I have a specific gravity of 1.5 and I weigh out 250 grams of glaze, that means I have 100g water and 150g glaze?


Or another way, I get 111ml of glaze that would weigh 166.7g or 66.7g water and 100g dry glaze?