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Tony Hansen's Thousand-Post TimeLine

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


29 mugs made from one 20kg box of Plainsman H443 clay

Made by Tony Hansen (one mug is missing from the picture). Total capacity of the mugs (filled to the brim) is 13 liters of water (13.7 US quarts, 11.4 Imperial quarts), or about 440 ml per mug (14.9 US fl oz, 15.5 imperial fl oz). Trimmings were discarded, these would have made a couple more mugs. ... more

Wednesday 28th June 2017

Solubles salts on a porcelain mug are causing plucking

Fired to cone 10R. The porcelain contains bentonite and a plastic kaolin, both are contributing iron-stained solubles that come to the surface during drying. They tend to concentrate on this foot ring. The solution is to employ a little barium carbonate in the porcelain recipe to precipitate the salts. These could also be sponged or sanded off in the dry state.

Tuesday 27th June 2017

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

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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

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Interactive glaze chemistry calculations.

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