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Tony Hansen's Thousand-Post TimeLine

I am the creator of Digitalfire Insight, the Digitalfire Reference Database and Insight-live.com. ... more

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Want bright orange on your ware?

Orange is a very difficult color in ceramics. Inclusion stains are the only reliable method and universally used in industry. But you could ignore that and try a bunch of recipes online, buying exotic materials to complete each one. Maybe one will be orange enough, but will it craze or run or ... more

Friday 10th May 2019

When the cone does this I need to adjust the program

This is a cone 04. It is bent too much, the kiln has over-fired a little (cone 03 was also bent somewhat). The built-in firing schedule goes to 1945, that would be much more over-fired than this was (and the built-in ones do not soak, drop-and-soak or slow cool). It only takes a minute to edit the ... more

Friday 10th May 2019

Fine tuning the amount of Darvan in a terra cotta slurry

This is slurry is made of 80% Redart and 20% KT1-4 ball clay. It has very good casting properties IF it is deflocculated well (smaller pieces can be cast in 10 minutes and extracted from the mold in another 10). However high-iron slurries are notorious for gelling, either right away during mixing or ... more

Friday 10th May 2019

Soda fired porcelain vessel by Heather Lepp

This is a small cup-sized object made from Plainsman P600 (simply composed of Tile #6 kaolin, nepheline syenite and quartz). It is valued as a product-of-the-process piece, consigned to the "kiln God" as unglazed. It exhibits carbon-trap, soda glaze deposition and flashing. The soda-vapour ... more

Friday 10th May 2019

Tin Oxide is expensive, do not waste it

This is a cone 04 glaze on a terra cotta body. Two 300-gram test batches were made. Both have 5% tin oxide added. The one on the left was high-speed propeller-mixed for 10 seconds on a closed container. That was not enough, small agglomerates appear as white specks floating in the glass. The one on ... more

Friday 10th May 2019

Manually programming a Bartlett V6-CF hobby kiln controller

I document programs in my account at insight-live.com, then print them out and enter them into the controller. This controller can hold six, it calls them Users. The one I last edited is the one that runs when I press "Start". When I press the "Enter Program" button it asks which User: I key in "2" ... more

Friday 10th May 2019

Incredible Titanium Dioxide in a calcium matte

The glaze is G1214Z cone 6 base calcium matte. 5% titanium dioxide has been added. This Plainsman M390 tile was fired at cone 6 using the PLC6DS firing schedule. Titanium can create reactive glazes, like rutile, even with matte surfaces (provided the glaze has good melt fluidity). Calcium mattes ... more

Wednesday 8th May 2019

The difference propeller-mixing a glaze can make

The glaze has 5% added titanium dioxide. These were fired at cone 6. The titanium in the one on the left remained agglomerated, it did not disperse in the slurry during hand mixing (the agglomerates can be seen as white particles floating in the glass). On high-speed propller-mixing the effect on ... more

Wednesday 8th May 2019

M390 mug by Sarah Pike

Wowzers! These are actually hand-made, not thrown on the potter's wheel. You can see the vertical join by the handle as it rotates. Her's is a simple concept: A red clay (M390) with a thin application of partially opacified matte glaze. She flaunts a bare red clay base, polishing it. You can find her easily on Instagram and google.

Wednesday 1st May 2019

Titanium as an opacifier

This is a lithium glaze fired at cone 6. It has 6% titanium. This effect will also work in other types of transparent recipes. There should be more blue with slower cooling. Mixing some rutile in (e.g. 4 titanium, 2 rutile) should enhance also. 6% is pushing the edge of how much titanium should be ... more

Monday 29th April 2019

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Test, Document, Learn, Repeat in your account at insight-live.com

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Chemistry plus physics. The on-line successor to desktop Insight. Get an account for as little as $15. It does so much more.

Conquer the Glaze Dragon With Digitalfire Reference info and software

Still available for Mac, PC, Linux

Interactive glaze chemistry calculations (legacy, no longer supported)


What people have said about digitalfire

• My pleasure -- your database is a wonderful set of reference info, and if I can help make it even more accurate and/or complete, I'm happy to do so.

• Just wanted to tell you I just found your site and find it extremely useful. Got it bookmarked and will be referring to it frequently. Great job! Thank you!

• Your attention to the people has been allways great, as its your software, thanks for the support.

• Everything you guys post on this page is materials science nerd gold.

• I have only been involved with ceramics and glazing for about a year now, and I'm hungry for knowledge. The wealth of information you have on your site and in your products has just been great.

• I enjoy and appreciate your work very much.

• After a lot of testing of various glazes I've decided he's overdue for sainthood.


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What people have said about Insight-Live

• The articles contained very helpful. I work for luxury table ware well known brand from UK.

• First I want to thank you for the service you're providing the ceramics community at large.

• I am a long time admirer of your ceramics data base and teach at ... University.

• I just want to say THANK YOU for this incredible database of information. Thank you, thank you, thank you!

• You are a real gem, your work really help me a lot.

• WOW, WOW, WHAT GREAT INFO! thankyou! I am going to pass your site on to someone i know who is more keen on the science of glazes, than the potting, unlike me... she will love your test works and pics Wow! Thanks again.

• Had quite quite a few problems learning to enter recipes.


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