How to Mix a Pottery Glaze - Reading and Mixing a Ceramic Glaze Recipe
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- Опубліковано 29 сер 2024
- Commercial Glazes are great, but we have learned SO MUCH mixing our own glazes. You will need to wear a mask and be in a well ventilated space or outside. There is also an initial investment of materials. But the cost of testing new glazes is a tiny fraction of what you pay for commercial glazes plus shipping. Now I can create MOST glazes in a test batch for only a few dollars. I was not a very engaged student in 9th grade chemistry class - the last chemistry class I remember taking. But in now that those letters mean something to me, they are suddenly interesting! Who knew! 🤪
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Thanks for watching!
Love that your kid is doing it with you!
Me too. Thank you!
I hope you get to meet John someday!! He is as cool as you can imagine!!🤗 great video too thank you!!
That would be really cool. I'd love to meet him! Thanks Kathleen -mj
John Britt's free you tube videos on glazes are amazing!
He's the best! -mj
Good job Jake! Way to help your Pops with those math skills!
Thanks Suzy. It's been a few years since we did this video. He has now surpassed his dad's skills in math, pullups and many other areas. I'm really proud of him. Thanks so much. -mj
As a fellow Texan, I can't help but marvel that you are not sweating constantly with the garage door open in September in Central Texas! Historically, it's in the mid to upper nineties around that time. Is your (awesome) garage studio heated or a/c'd?
I've been don't a lot more work on the computer lately :) the parts of the business i don't enjoy as much. It does force me to get out there earlier in the morning (my favorite time to throw anyway) in the summer. Glad to know there's a fellow Texan watching :). Thanks Wendy! -mj
Thank you very much I loved your video. Very helpful. Would it be possible to know the specic gravity of your Jen's Juicy with iron ?
Hey Gregory. So sorry for the late reply. I think the specific gravity for JJF is 1.56. That's the number taht comes to mind and i'm pretty sure tat's right. That's one of my favorites. it is so versatile! It's pretty thick. Hope that helps! -mj
They are cool !!
Thank you Jyothy! I appreciate that.
Do you ever make the “orange version of JJF”? Also, how much do these move?
Yes I do and I like it a lot. It creates a really great dirty surface over my base white glaze. I like JJF a lot - Thank you Jen for making JJF, whereever you are :). Thanks for asking Jessica. Sorry it took me so long to reply :( -mj
I love your videos! Can't wait to heat up to my source in Austin and begin mixing glazes! I saw a video recently on adding a small amount of glaze to underglaze on greenware and doing a one-step glaze firing rather than going from bisque to glaze. What are your thoughts and have you tried that?
Thank you BB Jo! Sincerely. That means a lot.
Regarding single firing it can be a little riskier. I don't have bisqueware explode often but it does happen on occasion when I"m bisque firing. When it's just bisque it usually just affects the exploded piece. But you can imagine how many pieces on the shelf would be affected if that unbisqued vessel exploded with glaze all over it. I've only singe fired a few times and made sure my pots were very dry first. I think it's awesome just be careful to have your pots all the way dry first!
Here's an article from Steven Hill who does some single fired work which looks amazing! ceramicartsnetwork.org/wp-content/uploads/2009/02/cmjan06hill.pdf.
I also recently did a video on Hill's firing schedule here: ua-cam.com/video/H6nmVdqizog/v-deo.html
Benner Barclay here in Texas also does a lot of single fired work. I have one of his mugs in my shelf and I LOVE it!
Thanks again for the encouragement BB Jo!
mj
Great, interesting video. I see you make a small amount of each glaze. How do you apply it?
Hi Julia. I usually dip but i was mainly dealing with small vessels. Now I usually apply a base coat of white then spray, brush or dip the vessel as a second layer. That's what i've been doing lately. Thanks for asking! -mj
How long do you wait before you use freshly mixed glaze?
i usually wait one day. that's usually plenty of time to make sure any chunks get soaked and then broken up when you mix it before glazing. Thanks Wendy! -mj
Help explain the amount of water in relation to dry mix. I tried John Bits recipe and totally failed assuming my ratio of water to dry mix was way off
Thanks. And I enjoyed your video
I totally get it Glenn. This water to mixture ratio is called "specific gravity". Coyote Clay's website has a lot of good tips on exactly how much water to mix you need with their glazes. The amout of water you put in will drastically affect the glaze.
So basically you find specific gravity by filling a container to a set amount (say 100 ml). Then you weigh that mixture (say the mixture weighs 150g). So 150g/100ml is a 1.5 Specific gravity. Dont' forget to subtract out the wight of the container your weighing the mixture in too!
I can do a video on this if you like Glenn. it's kind of a hard concept to explain but it makes a WORLD of difference in your glaze resutls... specifically in repeating results as you create multiple batches of the same glaze.
Let me know Glenn if you'd like to hear more about it. Thanks for contributing!
Hi, How do we know how much water to add? I know you added half again the water to the dry ingredients but doesn't it need to be precise to have the glaze be the right consistency? Thank you
Dana, you are absolutely right! it does need to be very "specific" 😉 😉. . The technical term is called SPECIFIC GRAVITY and it refers to the "weight to water ratio" of the glaze mixture. Coyote Clay has some great specifics on mixing and specific gravity here: www.coyoteclay.com/Dry.html
the formula for specific gravity is WEIGHT (in grams) / VOLUME (in ml). So practically this looks like:
1. fill a container to 100, 500, or 1000ml with the glaze you're measuring.
2. weigh how much the the glaze in the container weighs.
3. subtract the weight of the container itself (mine is usually about 42 grams)
4. divide GRAMS / MILLILITERS. = SPECIFIC GRAVITY of that mixture
The same glaze will often look very different at a different specific gravity. it's good to know what the glaze maker or recipe provider suggests for specific gravity.
This would make a good video i think. When i open up a kiln to see something i was not at all expecting, it is USUALLY because my specific gravity is off in one or more glazes. Great Question!
Where do you buy your elements for mixing the glaze?
Hey Morrisa. I'm in Waco, Texas and I drive to Trinity Clay in Dallas, American Ceramics in Fort Worth, or Armadillo Clay in Austin. So I'm traveling a couple hours in any direction to get my supplies. Sometimes when I just need a little I'll call and have them ship it instead. I've shipped big orders as well that would be too much load on my car for me to carry. I would search for "pottery supply store in/near CITY" to find the place closest to you and then call and ask if they sell elements for mixing glazes.