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From a 1959 home, this glaze is satin, and the glaze seems to randomly "bunch up" and show a darker under-color.

I have seen the same kind of glaze in a light grey with a dark grey under color.

I imagine some chemical ingredient increases surface tension, since the glaze really does pile up a bit on the borders of the crackle look. I wonder if lead was required in the formulation. I cannot tell if a separate underglaze was applied to create the contrasting color, or if it is just a part of the glaze itself.

At least one tile in this glaze was factory made in Italy.

Any insights or guesses would be welcomed!

Hi Nancy,

    It looks like a glaze with a lot of "float" in it.  I bought some glaze from Bath Potters that is a ringer for it called Blue Speckle.  Problem is it was on close out and they don't make it any more.  When I asked why, I kind of got the feeling that it may have had lead in it. A lot of the Amaco Potter's Choice glazes have the "float" in them, but they have to be put on thick.  The "float" is just crystals floating on the clear glass matrix.  Cooling has a lot to do with it forming. Western Glazes has a few that look like that but I think the ones that do are earthenware glazes.  jhp

Very good ideas to pursue! I am very open to lower fire options so appreciate the tips.

I've had fun playing with Assad Black which creates a matte, except in areas where the glaze is thicker.

It's colored with 4.2% copper carbonate in a nepheline syentite glaze.

A layer of Assad Black, then coated again and refired.  When thick it crawls.

A thinner layer of Assad Black on the interior. Over a titanium dioxide wash on the exterior.

I see what you mean. It does create a very intriguing surface.

Norm Stuart said:

I've had fun playing with Assad Black which creates a matte, except in areas where the glaze is thicker.

It's colored with 4.2% copper carbonate in a nepheline syentite glaze.

A layer of Assad Black, then coated again and refired. When thick it crawls.

A thinner layer of Assad Black on the interior. Over a titanium dioxide wash on the exterior.

After more research and reflection, your magic word "floating" led me also to the Digitalfire database on this type of glaze and its evolution and components. Thank you again.

Jeff Poulter said:

Hi Nancy,

    It looks like a glaze with a lot of "float" in it.  I bought some glaze from Bath Potters that is a ringer for it called Blue Speckle.  Problem is it was on close out and they don't make it any more.  When I asked why, I kind of got the feeling that it may have had lead in it. A lot of the Amaco Potter's Choice glazes have the "float" in them, but they have to be put on thick.  The "float" is just crystals floating on the clear glass matrix.  Cooling has a lot to do with it forming. Western Glazes has a few that look like that but I think the ones that do are earthenware glazes.  jhp

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