Turquoise
Turquoise is a glossy raku from Spectrum's Raku line, fired cone 06.
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The quick version of Turquoise
What this glaze does
Turquoise on our shelf, fired as raku. What the reduction can is packed with changes this more than anything you brush, so the same glaze gives a different pot every firing.
Our sheet records it as copper, teal, brown, glossy.
Clays that suit Turquoise
B-Mix with Grog, 52 Buff, or Berlin Gray. Those are the three bodies we raku on.
Raku clay is not optional. The pot goes from around 2000 degrees to open air in about four seconds.
Applying this glaze to your work
Spectrum set these up for brushing and say they can be poured or dipped if thinned a little with water.
Peak temperature matters here. Spectrum recommend most of the series to a peak around 1700 to 1750F and a subset around 1600 to 1650F, and note that different combinations of peak and reduction temperature give different results.
Spectrum set these up for brushing and say they can be poured or dipped if thinned a little with water.
Peak temperature matters here. Spectrum recommend most of the series to a peak around 1700 to 1750F and a subset around 1600 to 1650F, and note that different combinations of peak and reduction temperature give different results.
From The Clay Hole University
More info about Turquoise below, but first... Everything we teach about glazing, written down and taught properly. These are the glaze lessons, and they are a small corner of a library that runs from centering your first pot to selling your work.
GuideGlaze Brushing Techniques, Coat by Coat
GuideGlazing Big and Intricate Pottery Faster
GuideGetting the Most Out of the Mega Glaze Tool
GuideMaking, Logging and Dialing in Test Tiles
GuideGlaze Problems, Causes and Fixes
GuideGlazing on the Wheel for Even Coats and Clean Bands
GuideOxide and Carbonate Washes
GuideWhen to Use Celadon Glazes
GuideHow to Use Dipping Glazes
UnderglazeHow to Use Underglaze: Techniques, Rules and Firing
UnderglazeMishima: How to Inlay Slip and Underglaze into Carved Lines
UnderglazeWipe-Away Texture: Underglaze and Oxide Washes on Bisque
Firing Turquoise
Spectrum fire this series anywhere from 1600F up to cone 06, which is 1850F, then cool to about 1600F before the pot comes out red hot and goes into the can.
None of this is yours to manage. We handle everything on the kiln side, and every glaze on our shelves can be fired safely in our studio.
Food and function
Raku is not food safe and never will be. Not with a sealer, not with a liner glaze.
The body is fired hundreds of degrees below vitrification so it stays porous, the glaze is crazed, and raku glazes carry copper and other metals. It is not watertight either: water passes through the body over hours, so a raku vase full of flowers is a slow leak on your furniture.
Spectrum add that although none of these contain lead, many are over the copper threshold and are considered toxic in the liquid state. That is a handling concern in the glaze room, which is another reason this shelf is workshop only.
Raku is not food safe and never will be. Not with a sealer, not with a liner glaze.
The body is fired hundreds of degrees below vitrification so it stays porous, the glaze is crazed, and raku glazes carry copper and other metals. It is not watertight either: water passes through the body over hours, so a raku vase full of flowers is a slow leak on your furniture.
Spectrum add that although none of these contain lead, many are over the copper threshold and are considered toxic in the liquid state. That is a handling concern in the glaze room, which is another reason this shelf is workshop only.
Our test tile pots
This family does not have a test tile pot. The colors and results come out close enough to what the book shows that a pot would not tell you much more, so work from the printed Glaze Bible and the tile above.
More ways to pick a glaze
Membership levels that may use this glaze: Raku
Not sure whether this glaze suits what you are making, or how it works with our system here? Ask an instructor. That is what we are here for, and a two minute conversation at the shelf beats a fired pot you did not want.
About these images and what your pot will actually look like
We have done our best to represent every glaze here accurately, and you should still expect your pot to look different from what is on this screen.
Our glaze tile images are digitally created. They are built to show the character of a glaze, not to be a color match.
A screen is not a printout, a printout is not a test tile, and a test tile is not a finished pot. Each step in that chain shifts what a glaze looks like, sometimes a lot.
On top of that, the pottery itself changes the result: the clay body, how thick the glaze went on, whether it was brushed, dipped or sprayed, what was layered under or over it, where the piece sat in the kiln, how hot that spot ran, how fast it cooled, what was fired next to it, and how much texture the surface had. Two pots glazed from the same jar on the same day can come out different.
Treat every image here as a starting point, and treat a test tile fired on your own clay as the real answer.