Thursday, May 28, 2015

Barium copper blues

Here are some tests I ran for the upcoming workshop June 5-7, 2015 in Greenwood SC which we can talk about. I found them interesting.

On the left is Otto Heine Barium Blue page 120 in  my Mid-Range book, the second tile is Otto Heino with a straight substitution of strontium carbonate for barium carbonate, tile 3 from the left is Pinnell strontium matte page 123 (it is basically the same recipe but with 1.0% lithium carbonate vs the 2.7 % in the Otto Heino glaze) and the tile on the right is Pinnell strontium matte with and additional 5.0% titanium dioxide. All have 3.5% copper carbonate.

All fired to cone 6 electric in cycle E1.


Allison Kruskamp said...

Thank you Thank you Thank you for your diligence and record-taking. We are better potters for it!

Raina Lee said...

Hi John, I tried a version with Barium and colorants 3% copper and 1% cobalt and it turned out very blue, with some cloudiness where it was applied in 2-3 layers. Is there a way to get the intense blue without the cloudiness? I assume it’s the barium crystals clouding up. Thank you!