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Chemistry plus physics.
Maintain your recipes, test results, firing schedules, pictures, materials, projects, etc.
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What people have said about Digitalfire- You are world famous consultant & that is why asking your opinion in details about above (best solution from production quantity, quality & optimal cost).
- I am impressed with your site - it is very comprehensive.
- When my group of potters are pressed to improve our glazes they say if the old way is not broken yet why don't you buy yourself some kind of a kit to play with new glazes and then we can make it for everyone. You got to be kidding I say to myself. Anyway, your website will help me help the group out of some old and boring glazes if I can see forward enough. Thanks for all this important info, I can't believe this website is here!
- We have been aware of your company and website for many years and see it as a model in its approach to educating makers about the processes involved in making/drying/firing. You teach them to take responsibility for their work process rather than blaming the product.
- You are so good for me. Find a stumbling stone and in a moment the path is easier.
- 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!
- I have read just about all your articles on Digitalfire and use your software, really appreciate the wealth of knowledge and testing you bring to ceramics.
- You have such a goldmine of information available on your Digitalfire website and I am asking your permission to, not only use some of it, but to direct the students to your website for more info than I could ever convey.
- Your glaze expertise is the piece of the clay puzzle that I need to relax and enjoy this artistic journey.
- I'll be reading and studying for a while, but what is so great is that the information is now right at my finger tips anytime that I need it - its all so very interesting - I never thought that chemistry would ever be interesting, - and I know now very soon I too will be able to slay the glaze dragon!
What people have said about Insight-Live- Thank you for your very informative website - it is a real help to one who has spent 40 years potting.
- I read your articles for years, and it really helped me to better understand ceramics.
- I am a Brazilian potter and, despite my difficulty with the English language, I have learned a lot from this site. I want to thank you very much for the immense help you give me in the "most difficult times".
- I am a production potter and I have been using your website for information, and I have made many improvements from articles posted on this site.
- You are a real gem, your work really help me a lot.
- Sir, I'm a big fan and pupil of you from India. I am 27 years old. I always read digitalfire. I share with my mates to understand the ceramic from digital fire.
- Thanks for sharing your extensive knowlege with the clay community.
- Extremely useful resource Digital Fire. By the way your writing style is truly unique and is easily understandable even though of technical nature.
- I'm glad I was of some small service. Your whole venture is a marvel. All the best as we go forward.
- Thank you! Tony for all of the impressive work that you have contributed to our industry over the years. Your glaze work has been super helpful.
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Blog
Forget the flowers
Too much environmental impact
Hundreds of bouquets of flowers will have a significant environmental impact. I sent one and if you already sent one, I will credit your Insight-live account for 4 years, just let me know. I have other things in mind, will let you know.
Saturday 20th June 2026
GoFundMe Stopped at 20K
https://www.gofundme.com/f/help-save-digitalfire
Wow. And to Dominic Legault, who set this up and stopped it. It is not the money; it is knowing that my work has been worth something to you. My friends and neighbors don't know what I do for a living. Now they do!
Maybe I should get a car! Just joking! I'll use it to better ensure the survival of Digitalfire. Laying the groundwork for that is primarily a technical challenge for me and people I can bring on board virtually. Here is the plan:
Geeky stuff starts here
It is a code-museum (because I started around 1982 using dBase II). That being said, about 5 years ago I converted Digitalfire to an API fronted database that endpoint code calls to create pages on the fly. This is coupled with a backend custom content management system that interacts directly with the database; thus, no pages are edited, only DB records. But a lot of old code is still there. Here are the current priorities:
- The code is only partially on GitHub (required for team development and code analysis). I am refactoring it to adhere to PSR-4 coding standards (this is a rote process that I have been working on for about 6 months). As soon as I am ready, or before, I'll need help to write or improve the unit testing.
- Document and publish the API to enable coders to create products that use the data from the API (e.g. machine translation). Explore refactoring in Python or JS/Typescript.
- An MCP server, in Typescript or Python, to respond to queries from answer engines, thus supporting AEO.
- Front the content management system in a secure way so that multiple people can start contributing and error checking. Convert to API access.
Other priorities that recent events indicate:
- Implement a hashtagging system in the people database (for the newsletter) so that any who offer help can be classified and not forgotten.
- Adopt Creative Commons licensing to enable students and teachers to quote and use without fear of copyright issues.
- Document testimonials well to be able to demonstrate harm if the service is ever compromised.
As noted above, at the beginning of Covid, I redesigned Digitalfire as a client/server page generation system. An API, fronting the database, can run on one server while the page-generator can run on another server (by querying the API). There is a lot of caching. The content management system is custom-written for the information hierarchy; it runs on the same server as the API.
Saturday 20th June 2026
Resolution Achieved!
If you already sent, get 4 years Insight-live credit
I need goodwill with Plainsman. I know you are passionate about this whole affair in the past few days. I underestimated how much. Some were so passionate they have caused trauma with Plainsman staff, we must undo that. Having goodwill with the company I partnered with to make Digitalfire is so important and will make me so happy. We both "pulled the dragon's tail" over misunderstandings. Here is the biggest one: Digital Fire is not at risk and never was from Plainsman. I need goodwill, especially if you put staff under stress, and you can help me get it. My first idea was to fill their office with hundreds of bouquets of flowers, but now I realize that's too much enfironmental impact. I'll credit you 4 years of Insight-live if you already did.
Friday 19th June 2026
Please Stop!
Please, everyone stop bashing Plainsman. I never intended that. Thier staff is suffering under attack. They are really upset. So much of this is misunderstandings. We both pulled the tail of a dragon.
The message that I put up that Digitalfire would shut down on June 26 because I was unable to meet the demands in the lawyer’s ultimatum is what made me fearful and started the whole thing. I was deluged with messages I couldn’t hope to answer so I created a response and pasted it in. I texted that response to Plainsman as well so they knew what I was saying. I should have stated more strongly that this is not about bashing Plainsman. I am very sorry for that. They are better positioned than any other company in North America because they have their own clay deposits, I want to work with them not against them.
Friday 19th June 2026
1988 Insight logo reimagined by Gemini
The old logo is from the late 1980s and was used to promote Desktop Insight at trade shows and to advertise it in magazines and later on the early internet. It was done in Aldus Freehand, an early competitor to Adobe Illustrator. Vector graphic illustration was revolutionary at the time. Amazingly, many artists even today do not know what vector graphics is, they are still working with "pixel pusher" apps like Photoshop.
I asked Gemini how it made this, and it said: "I started with a blank canvas of random digital noise (a chaotic grid of pixels) and gradually refined that noise over multiple steps based on your prompt and the layout of your original image. There was not need for a vector stage; the smooth transitions, glowing embers, and soft gradients are baked right into the generation process from the very beginning."
Context: Here is what digitalfire.., Digitalfire Insight
Saturday 13th June 2026
Same body, same outside glaze.
But the inside transparent glaze is different
Glazing black clay bodies stained with manganese is just about impossible with typical transparent glazes. The glaze over-fluxes the clay surface and ruins the color. Worse, if it accelerates surface maturity, the body can blister or generate LOI gases that blister the glaze. How about transparent glazes over a black engobe instead? At least the body color is not lost. But the wrong transparent glaze can do what you see here (inside left).
These mugs are a buff stoneware, Plainsman M340. A black engobe was applied by pouring the inside and dipping the outside two-thirds of the way down.
Left: A L3954F black engobe was applied inside and upper exterior at leather hard. After firing to cone 6 using the PLC6DS schedule, G2926B—which is crystal clear on M340 itself—became completely clouded over the engobe because bubbles generated during firing remained trapped in the melt.
Right: The entire mug was dipped in GA6-B. The Alberta Slip particles and the melt characteristics of GA6-B promote bubble coalescence and escape, producing an exceptionally glossy jet-black surface over the same engobe.
Monday 8th June 2026
Here is what dipping engobes can do:
Go on even. In one coat. Stay put.
When you learn to make and use engobes correctly, they make magic possible. Here I am turning a dark rustic body into a smooth white one (rear mugs) and a white body into a dark one (front). The engobes have been applied at the leather-hard stage. That is the perfect time, the engobe and body are clay bodies, designed to fit each other; they dry together and fire together creating an inseparable bond.
Handles have been applied, and they have dried to stiff leather hard. Engobe was poured in, poured out, then the mugs were pressed, lip down, into it and extracted. No dwell time was needed. This dipping engobe is DIY thixotropic (not available commercially anywhere). That means I tuned it just before use, to just the right degree of gel (enough for it to drain to the right thickness, then gel just as the last few drops fall from the rim). Honestly, these are a beauty to behold at this stage, the silky, drip-free surface is just so perfect.
Context: L3954B, How stop dripping and.., Here s how I.., Why your supplier does.., Why your supplier does..
Monday 8th June 2026
Republishing of Digitalfire Content
I wish to express my gratitude to all the people and organizations around the world that have been republishing content on Digitalfire (most often with translation). They are mostly people who love ceramics and IT like me; on every continent. When people ask, I almost always agree; when they don’t it is still ok. To make things clearer I will put content under a licence to control use: Likely CC BY and ODC-BY. I feel gratitude that the pages are valued (so please don't hassle them for copyright infringement). Thank-you messages, often emotional, have arrived almost every day for many years. They come from individuals, but also large corporations, schools, organizations and even high-tech industries. Some work in the background, the mainstream or management unaware of their brilliance. I've gotten thousands of cups of virtual coffee and countless donations in the past few years. It is a little overwhelming! Some very exciting liaisons are forming with republishers; you will see them as outgoing links and added functionality at digitalfire.com.
Context: Digitalfire Reference Library
Sunday 7th June 2026
No glaze chemistry needed
At least not right away
You have 147 glaze recipes. How can you get your head around all of them? Is glaze chemistry needed? No, that's a "maybe" way in the future. Right now, you need to start organized documentation. The recipe for each. A few pictures of each fired on different clay bodies, different thicknesses. Perhaps slow and fast-cooled firing. This is what an account at Insight-live does well. What it does even better is tracking your testing. The first step is to assign each recipe a proper code number (replacing these) and write that on all test specimens and buckets. From this point on, learn. Record every observation you make about each in its notes.
Through all of this, constant use in the studio (or factory) will never stop surfacing problems (e.g. settling in the bucket, crazing, running, blistering, material issues, etc.). The seriousness of each will determine the level of attack. First, identify the mechanism of the desired fired result. If it is a base recipe plus additions of colorants, opacifiers or variegators, then check if the base of one of the other glazes has a similar surface texture and character. If so, then could the additives in the troublesome one be used with the better base? If not, then it's time to sanity check the recipe and bring out the heavy guns of at least looking at the chemistry. But in Insight-live, you only need to turn on the display of the unity formula (there is nothing else to do). Next, make sure each material in the recipe links to one in the material database (so the calculated formula is accurate). Then compare the calculated unity formula with a limit formula (often a simple sanity check, like with the recipe, quickly spots oxides that are in excess or are short.
Thursday 4th June 2026
A transparent glaze is going satin:
Is it the feldspar and kaolin substitutions?
A potter reports that a switch from G-200 feldspar to Mahavir, and EPK to Imerys kaolin, has resulted in this transparent glaze becoming more satin. Is that possible? Yes. Because this glaze is on a unity formula tipping point.
To see it, you do not need to know how to do glaze chemistry, just how to display the calculated unity formulas side-by-side. My Insight-live shows them here. The material change has little effect. But there is an anomaly: 0.29 MgO. That is magnesia matte territory. The MgO is very likely there to help bring the thermal expansion as low as possible (to avoid crazing). For people who cool their kilns relatively quickly, this fires glossy. But a material change could well affect the cooling rate needed to maintain the gloss. That being said, the potter may also be firing slower, yet attributing the mattness to the materials. Or it could be a combination of both.
This is a popular glaze, among others in the book "Mastering Glazes". In Ron Roy's circumstances, and for many others, it is glossy. But for this potter, a small change (in the recipe materials and also likely in firing) has produced this issue.
Context: MGBase3, Tipping point
Thursday 4th June 2026
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