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

Rich, natural but vibrant colors. How was this cone 6 M390 mug made?

The clay is Plainsman M390. The inside glaze is G2926B cone 6 base transparent. The outside glaze is the same recipe but with 4% added red iron oxide (screened to 80 mesh). A white engobe (L3954B) has been applied inside and outside down to the midway point (done by pour-filling the leather-hard ... more

Monday 26th June 2017

A Cone 6 white engobe works miracles on these dark and buff burning bodies

Left is Plainsman M340. Right is M390. Each mug has been white engobed inside and half-way down the outside. The insides have been glazed using G2926B clear. The inside surface has more depth and has a richer appearance than you could achieve using a white glaze (especially over the dark burning ... more

Saturday 24th June 2017

Iron oxide vacuums up glaze bubble clouds at cone 6

These two mugs are the same dark burning stoneware (Plainsman M390). They have the same clear glaze, G2926B. They are fired to the same temperature in the same firing schedule. But the glaze on the left has 4% added iron oxide. On a light-burning body the iron changes the otherwise transparent glass ... more

Friday 23rd June 2017

GA6A Alberta Slip base using Frit 3249 and 3195 on buff body

The body is buff burning Plainsman M340 (cone 6). The amber colored glaze is 80% Alberta Slip (raw:calcine mix) with 20% of each frit. The white engobe on the inside of mug 1 is L3954A (also glazed inside using transparent G2926B). These frits are producing an amber gloss glaze of high quality. On ... more

Friday 23rd June 2017

A cone 6 clear glaze plus iron vs. Alberta Slip clear base

These two mugs are made from a dark red burning stoneware and fired in a cool-and-soak firing schedule. A white engobe (L3954A) has been applied on the inside and half way down the outside. Both are glazed inside with G2926B whiteware transparent glaze. The outside glaze on the left is the same ... more

Friday 23rd June 2017

P300 and M370 mugs with GA6A Alberta Slip (using Frit 3249)

Rather than the normal 80:20 AlbertaSlip:Frit3134 recipe, this one substitutes Frit 3249 (super low expansion). The glaze is less runny and even glossier. These are fired at cone 6 in a cool-and-soak firing. They survived boiling water:ice water tests without crazing. The finish is dazzling, a ... more

Friday 23rd June 2017

Digitalfire Insight in 1983. On a Macintosh 128K and original IBM PC.

These were the computers that began the revolution. Insight was there!

Friday 23rd June 2017

How to make a ceramic time-bomb

This mug is pinging loudly and literally self-destructing in front of my eyes! Why? The glaze is under so much compression (the inside is pushing outward, the outside inward). Spiral cracks are developing all the way up the side. Small razor-sharp flakes are shivering off convex contours. Why? I ... more

Friday 23rd June 2017

Bi-Clay strips test compatibility between engobe and body

Slips and engobes are fool-proof, right? Just mix the recipe you found on the internet, or that someone else recommends, and you are good to go. Wrong! Low fire slips need to be compatible with the body in two principle ways: drying and firing. Terra cotta bodies have low shrinkage at cone 06-04 ... more

Friday 23rd June 2017

Glazes of the same chemistry: The fritted one melts better

It seems logical (and convenient) to just say that the kiln does not care what materials source the oxides in a glaze melt. Li2O, CaO, Al2O3, SiO2 are oxides (there are about ten common ones). The kiln just melts everything and constructs the glaze from the ones available. Right? Wrong! Things get ... more

Friday 23rd June 2017

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.


How to reach us

From within your account at Insight-Live.com or

What people have said about digitalfire

• Thank you for your support, it is wonderful and appreciated.

• Thank you for all the great work you have done and the tremendous contributions you have made to the ceramics community.

• Firstly, I want to thank you about this very good site in the net which helps very much in the development of the ceramics industry.

• Being new to this I was fascinated by the amount of information contained on your website and impressed by what you are willing to share.

• Great resource!!!

• I have been in this ceramic line with 15 years experience covering the idustires right from porcelain insulators,vitrified tiles etc., With the help of chemistry graduation I started my career in the cermaic industry. This website is very much helpful in fine tuning and upgrading my experience with enhanced knowledge of ceramics.

• I am very delight about the services provided by your site. It is really very informative.

• Great Web Site, by the way, I have found a lot of your generously offered help and information very useful. Thank you!

• I love your website so much! I am a potter just starting to delve into the world of glazes, and I cannot tell you how incredibly useful this website is. I have already spent hours reading about chemicals. Thank you so much for this amazing resource!

• Again, thanks for being such a resource to potters over the years!


To see more (at random) refresh this page

DigitalFire Logo

Privacy Policy