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Matt Oz

Member Since 16 Dec 2011
Offline Last Active Today, 08:04 PM

Posts I've Made

In Topic: Last Glaze Fire Of The Year Today

Today, 07:52 PM

When it's all over, pat the banana slugs on the head and send them on their way, have a nice vacation.

In Topic: Bubble Glaze Experiment With Close Ups.

13 December 2014 - 04:52 PM

The black clay I used was a porcelain with black mason stain. These were a single fire, but I have used it on bisque ware and there are still bubbles if it is thick.


Firing schedule:

I have a slow warm up at the beginning but after that its just

300 degF/hr to 1980

110 degF/hr to 2180 or whatever bends cone 6

No slow cool or hold.


Here is one more of tile one through a magnifying glass, shows ever-smaller bubbles. Now I have to go fire up the Electron microscope,  where did I put that thing?


In Topic: Bubble Glaze Experiment With Close Ups.

13 December 2014 - 04:44 PM

Do we know what causes these bubbles?

It might prove helpful to be able to control this effect to one's liking.

I hypothesize that some parts of the glaze are becoming molten at a temperature below the temperature where the others are finished outgassing. Im thinking the frit.

Have you tried reformulating to eliminate the frit?

No I haven't tried reformulating, I hav'nt spent much time on clear glazes. I do have some control over the effect by varing the thickness of the glaze, if it's very thin than the bubbles aren't really noticable.


Here is a thread about bubbles in clear glazes from clayart that you and others might find interesting.


Bubbles in clear glazes @ cone 10r

In Topic: Bubble Glaze Experiment With Close Ups.

11 December 2014 - 05:34 PM

marvelous to look at!   can't wait for the chemists to comment.  how did you apply it?  your reference to "coats" makes me think it is brushed, correct?  how much did you enlarge the pictures?   are the bubbles pinpoint size?

Thanks old lady,


You are correct brushed on coats, I didn't take good notes so I'm only guessing, could have been more than 4.


The first photo of all the tiles is close to how it looks with the naked eye the bubbles look like tiny translucent specks floating in the glaze, close to pinpoint size and you can't tell there bubbles without a magnifier, It also has more depth to it than the photo can convey. My mediocre camera has a macro lens and says 8X zoom lens.


A lot of glazes have these micro-bubbles in them for instance Chun Glazes.

In Topic: Use Of Plastic In The Studio

11 November 2014 - 08:36 PM

beeswax and linseed oil.