There are a number of glaze tests on my web site in the Potters Corner if anyone is interested.  Many tiles are layered glazes some of which are commerical glazes I have tested plus many others.  Pictures are included.

 

Make sure you scroll down past advertizements at top of page.

Views: 3789

Reply to This

Replies to This Discussion

Randy - i checked your photos and saw several mentions of the grren matt and the blue matt. are these commercial glazes? if not, i would like to see the formula for both these glazes. they are very interesting especially when layered.
hopeing to try them on porcelain ^6
eleanor
The green matt and blue matt are from Jane Shatz. I do not have access to my glaze formulas right now but will get back to you tomorrow. Those glazes work great under and over nutmeg especially if you do a hold at 1650 F for one hour.
thanks in advance. i look forward to getting and testing them. i am running a kiln tomorrow and will include them if i have the chance. i do a slow cool from ^6 to 1900 then drop to 1400 with another slow cool. i will try it on my schedule to see how it works and then will probably try again with your ide of cooling.
From what I have gleaned from ClayArt with the iron reds the most important temp to HOLD is around 1650 F. I just do an hour HOLD after reach top temp at that (1650)temperature. I usually fire for 15 more minutes after my kiln sitter drops to make sure I get a hard Cone 6. That seems to work with the glazes I have been using. I was getting alot of pinholes in some of my glazes but started putting my med temp on both bisque and glaze firing to 5 hours. This cured my pinholing in my semi transparent glazes.
Eleanor

Here is the green matt. I derived this glaze from Jane Shatz Blue Matt. I used this glaze extensively under and over nutmeg. It works best using it thin over and under thin nutmeg. One coat of each. Consistency of milk.

Recipe Name: GREEN MATT

Cone: 6 Color: blue
Firing: Oxidation Surface: Matte

Amount Ingredient
7.2 Dolomite
11.3 Gerstley Borate--1999
13.9 Talc
39.1 Nepheline Syenite
9.5 Kaolin--EPK
19 Silica

100 Total

Additives
4 Copper Carbonate
6 Rutile
Green Matt over Nutmeg next picture is Nutmeg over Green Matt

The nutmeg over green matt usually turns out a nice smooth celadon green as long as both glazes are applied thin.
Attachments:
Hi Randy,
I went to your site & the one combo that got me going was the Baileys Red/Orange w/C. Shino & C.Red Gold over it. I didn't have time to make up a test batch of Baileys, so I took a tile & put Ketchup,Brick Red,Ron's Red, Red Wood, Flame & Pete's Tomato Red as the base. I had 3 different Coyote Shinos, Regular, Light Blue & Leopard. They went next. Then to top it off, I put Red Gold & JB's Brown. Talk about good combos! My only regret is that the test tile was white/buff clay instead of a red clay, so I think they will look even better on a red clay. Now I just have to throw something to put it on. Everything that I have sitting there bisqued is ^10. Anyway I am glad you did those tests as I would have never thought to do a combo like that. I had forgotten that I even had those Coyote glazes in the basement. This was a fast up & fast down. I wonder what a slow cool with a hold at 1650 would do? jhp
Jeff

I have never been disappointed by doing a hold at 1650 F. Everything seems to turn out great. I have discovered that layering is the only way to go at Cone 6. You can get some wonderful effects. Layer everything you have and it will be like Christmas time at every kiln opening.

Take pictures and show us your results. Share, share, share.............
So here is a test tile that I did after viewing Randy's site:

The vertical stripes from left to right are:
1-Ketchup
2-Brick Red
3-Ron's Red
4-Red Wood
5- Flame
6- Pete's Tomato Red #13(spangly version)
The 3 horizontal sections from top to bottom are:
1-Light Blue Shino
2-Shino
3-Leopard Shino
The upper stripe of each section is Red Gold & the bottom stripe is JB's Brown.
This was a fast fire to ^5 with a 20 min. hold, which gives me ^6 touching down.
This next pic is the same tile re-fired to 1220 C., quick cooled to 1100 C., then slow cooled(50 C./hr.) to 900 C. with a 60 min. hold @ 900 C. & then off.

jhp
I'm with Randy on the hold at 1650 for an hour.
This is a red glaze I use, almost identical to "Randy's Red"- got it years
ago in school.


flint-26
epk-4
RIO-18
Gerstley Borate-28 (I still have a stash, haven't subbed yet.)
F4 spar-18
talc-12


M^6 "Waterfall Brown" will also turn red if you fire this way.
I just experienced an unusual reaction with Coyote Cedar Shino, which I've been testing recently. Fired some to cone six. Peeked in the kiln at 350 F (yes, I know...but hey, I've seen Steven Hill pull his out of the kiln at 400...) I was sad to see that the Cedar Shino was dark brown, very overfired/burnt looking. Well, bummer. So I pulled that one piece out and sat it on the table to get a good look and feel sorry for myself. Went about my business glazing other pieces.
In about half an hour I glanced over and low and behold, the piece had turned from ugly dark brown to a lovely deep red, just sitting right there on the table! I've never seen a glaze react to room temp cooling like that before. It was neat.
So far in my testing this glaze has performed well and has had no problems with pinholing, crazing, etc. I probably wouldn't put it on a food surface, as it has encapsulated cadmium (at least not without having it tested on your claybody). Nor would I use it in combination with another liner glaze without stress testing it for COE compatibility.
We use a lot of coyote glazes and they do change colors as they cool.  We have had very good and consistent results.

Reply to Discussion

RSS

Videos

  • Add Videos
  • View All

Use These Links to Support Us

Low cost flat lapping disc can be used on you potters wheel if you, drill bat pin holes in it, and provide a trickle of water to cool it. At amazon.com, 120 grit for aggressive material removal. Click the image to purchase 

Members have had great things to say about John Britt's new book, Mid-Range Glazes. Click the image to buy from Amazon.com

Purchase Glazes Cone 6 by Michael Bailey, The Potters Book of Glaze Recipes by Emmanuel Cooper, or Making Marks by Robin Hopper, all available at amazon.comMastering Cone 6 Glazes by John Hesselberth & Ron Roy is now out of print.

Harbor Freight is a great place to find unbeatable prices for better HVLP spray guns with stainless steel parts and serviceable economy models, as well as detail guns, all tested by our members for spraying glazes, as well as compressors to power the guns. As yet no one has tested and commented on the remarkably inexpensive air brushes at harbor freight.

The critter siphon gun is a spray alternative that is well liked by some of our members, and is available at amazon.

Amazon is also a competitive source for photo light tents for shooting professional quality pictures of your work. They also have the EZ Cube brand favored by several of our members. You might also want to purchase the book Photographing Arts, Crafts and Collectibles . . .

If you are up to creating videos of your work or techniques you might want to invest in a flip video camera

Following are a few scales useful for potters. Your final price could be less or more - things change.

American Weigh Black Blade Digital Scale, 1000g X 0.1g $11.08 

For the non-digitally inclined the old standard Ohaus Triple Pro Mechanical Triple Beam Balance, 2610g x 0.1g, with Tare $169.00

And finally a low cost clone of the OHaus. The Adam Equipment TBB2610T Triple Beam Mechanical Balance With Tare Beam $99.62

ebay is a great alternative for many tools and the equipment used in the ceramics studio - kilns, wheels, extruders, slab rollers are often listed there both new and used.

Tips for Members

If you just want to spout off, it is best accomplished as a blog posting. If you want to get more guidance and ideas from other members, ask a question as a new discussion topic. In the upper right corner of the lists for both types of posting, you will find an "+Add " button. Clicking it will open an editor where you create your posting. 4/16/2014

© 2021   Created by George Lewter.   Powered by

Badges  |  Report an Issue  |  Terms of Service