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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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Use the contact pages within or outside your account at Insight-Live.com


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

• I have been thinking to thank you for the great help your interest in ceramics continues to inspire in my studio.

• Thank you for your work on behalf of the betterment of pottery.

• I found a link to your great site whilst looking at oxides/effects ... Generally, the website is brilliant and I've already learned a lot. I need to try it out properly before I go ahead and buy the full thing. Looks very tempting, as all the answers are in one place. The testimonials look promising too.

• I have been perusing through some of the level 2 areas of your site and am just in awe of what a great resource you have developed.

• Thanks - your help has always been prompt and useful.

• I enjoy and appreciate your work very much.

• You have been more than helpful and I will recommend your site to all of my pottery friends. Once again a big thank you.


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What people have said about Insight-Live

• Thanks for doing the timeline. I’ve told you before but it never hurts to say it again, this is great stuff and I get so much info from your posts. Extremely valuable!

• Tony, I looked at Insight Live today more carefully. It is quite an accomplishment! Congrats to you!

• Please continue this brilliant service!

• Sure do like Insight and I've switched to using the live version. It's excellent!

• I have went to this website for technical info for over 4 years now :) IT is absolutely amazing!!!

• Anyway I thank you for your efforts in putting together this wealth of ceramic science in this accessible manner.

• As a side note: most of the students did access your information in their presentations. I found it interesting that your work is becoming foundational.


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