Javascript must be enabled in the security or content
settings of your browser for this site to work properly

To learn more about cookies search for HTTP cookie at wikipedia.com





Click here for information about DIGITALFIRE Corporation

Tony Hansen's Thousand-Post TimeLine

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

  All | Last 10 | Next 10 | Reset
Is this your record keeping system?

Is this your record keeping system?

Keeping your valuable notes like this? Recipes? Test results? Are your pictures lost in a cellphone with no keywords or connections to anything? If you test and develop you need to organize in a way that a book cannot do. Like link recipes to each other and other things like pictures and firing ... more

Monday 14th January 2019

Trafficked online recipes waiting for a victim to try them!

Trafficked online recipes waiting for a victim to try them!

Last week a customer came to buy materials to mix these recipes she found online. Then we had a closer look. Many have 50+% feldspar/Cornwall/nepheline with little dolomite or talc to counteract their high thermal expansion, these are guaranteed to craze. Many are high in Gerstley Borate, it will ... more

Monday 14th January 2019

Two G2571A Bamboo color versions at cone 10R

Two G2571A Bamboo color versions at cone 10R

These mugs are Plainsman H450. Both have a black engobe (L3954N) applied to the insides and half way down the outside during leather hard stage (the insides are glazed with Ravenscrag silky matte and G1947U over the black engobe). The bamboo glazes can thus be seen over the black (upper half) and ... more

Monday 7th January 2019

G1947U Clear and Ravenscrag Silky Matte glazes on L3954N black engobe

G1947U Clear and Ravenscrag Silky Matte glazes on L3954N black engobe

Fired at cone 10R. Clay is Plainsman H450. The black engobe was applied at leather hard stage. The clear glossy glaze over it on the inside produces a deep and vibrant hue. The black engobe extends downward on the outside and it greatly darkens the glaze applied over it. On the edges of contours, where the matte glaze is the thinnest, the engobe turns the color almost black.

Monday 7th January 2019

A vitreous sculpture clay. Vitreous enough for functional ware!

A vitreous sculpture clay. Vitreous enough for functional ware!

The chocolate brown burning super-plastic base clay (to which 20% coarse grog is added) matures at cone 6. Yet this is a cone 10R body. The grog stabilizes the fired matrix enough that it stands up in the kiln. And it fires to a dense product that can withstand any weather. Any porosity that can be ... more

Monday 7th January 2019

A cure for long-time Gerstley Borate sufferers

A cure for long-time Gerstley Borate sufferers

These are various different terra cotta clays fired to cone 04 with a recipe I developed that sources the same chemistry as the popular Worthington clear (50:30:20 GB:Kaolin:Silica) but from a different set of materials. They key change was that instead of getting the B2O3 from Gerstley Borate I ... more

Friday 21st December 2018

We fight the dragon that others do not even see

We fight the dragon that others do not even see

There are thousands of ceramic glaze recipes floating around the internet. People dream of finding that perfect one, but they often only think about the visual appearance, not of the usability, function, safety, cost or materials. That resistance to understanding your materials and glazes and ... more

Friday 21st December 2018

How much feldspar to using in a Grolleg porcelain

How much feldspar to using in a Grolleg porcelain

These are porcelains are made using Grolleg kaolin. P700 (Plainsman) has 19% G200 Feldspar and Coleman (popular among potters in the US) has 31% (P700 switches the 12% to kaolin). Although the Coleman porcelain is more vitreous (top right) it is not more translucent. But it is a lot more problematic ... more

Thursday 20th December 2018

The specific gravities on two commercial underglazes might shock you

The specific gravities on two commercial underglazes might shock you

AMACO and Crysanthos. 1.26 (67.5% water) and 1.22 (68% water)! The former is well below their recommended specific gravity of 1.4 (it still paints well but needs more coats, and more time to dry and apply them). Strangely, the Crysanthos, although having a lower specific gravity is more viscous and ... more

Wednesday 19th December 2018

Here's how we used to record test results before we got insight-live.com

Here's how we used to record test results before we got insight-live.com

A potter is testing glazes on a new clay body. But this generates a lot of data, how is a person to keep track of it all? This is how we used to do it. An account at Insight-live.com is the new place to organize this. There is room for thousands, even millions of recipes, pictures, notes, firing ... more

Wednesday 19th December 2018

Contact Us:

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


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

Login to your online account

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

• Hi, I love your work and I would like to participate.

• LOVE your site! You have saved me a whole lot of work and research time with your materials data base and comments. I haven't gotten to explore your software yet because I'm in the middle of resolving another mess involving raw materials from a certain large company with sloppy production. We are a small company that is developing a low expansion, thermal shock resistant porcelain for industrial use ... Between our acquired data and some clues contained in your comments we were able to pin point the problem.

• Thank u for your helping researchers .. Thank u for your efforts.

• I Everyday visit your website http://digitalfire.com. Fantastic knowledge you have....thanks .

• I think Glaze chemistry is an extremely under-appreciated and under-estimated field of science.

• Thank you so much. This is what a good business looks like; great product, immediate response from the owner no less, and over the top service.

• What an awesome list of videos you have here, and the info on your site is invaluable.


Click here to see all 191

What people have said about Insight-Live

• I am a ceramic manufacturing manager, and before this position, I had no training on ceramics. I was taught our recipes, but none of it was explained. The dragon ran amok. After reading through your articles and descriptions, I feel I have learned so much about my own products, and I have a foundation for changing, improving, and troubleshooting my materials issues that I wouldn't have had otherwise. They taught us in engineering school that we all stand on the shoulders of giants, because we all get to use knowledge and tools at a moment's notice that took others years to develop. Thank you for sharing all that you have, so the rest of us can stand on your shoulders to do our work that much better.

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

• Please continue this brilliant service!

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

• Hello, I’m a 16 year old ceramic artist in North Carolina. I absolutely love digital fire and use it almost daily. One thing I adore about your mugs is your handles. I’ve tried to make them similar but can’t come anywhere near the perfection of yours. Can you help me?

• I write to appreciate your good works by way of the articles you made available on the net .. Thanks a million for your good work. From Nigeria.

• Thank you again for the amazing website and wealth of information!!! InsightLive is proving to be an incredible asset as well!!!


Click here to see all 107

DigitalFire Logo

Privacy Policy