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Titanium instead of rutile for floating blue

Rutile blue glazes are actually titanium blues (because rutile mineral is an impure source of TiO2 and Fe2O3). The iron and titanium in the rutile react to form the floating blue effect. The GA6-C recipe has always relied on a 4% rutile addition. Its GA6-A base recipe contains significant iron (because of the 80% Alberta Slip), so could titanium oxide deliver the same floating blue effect? Yes.

These mugs are M390 clay. The top left one is the standard GA6-C (with rutile) fired using the C6DHSC slow-cool firing schedule (the bottom left normal cool PLC6DS schedule produces little color). But the ones on the right switch the 4% rutile for titanium dioxide (the L4655 recipe). The top right was fired using the slow cool, the bottom right was the normal cool schedule.

Titanium is a much more consistent and reliable material than rutile. If it can produce an excellent blue color is produced even without a slow cool (lower right) then it is a better long-range choice.

Floating blue using titanium dioxide

Related Pictures

Amaco PC-20 vs Ravenscrag Floating blue


Ravenscrag Floating blue vs PC-20

G2917, which I mixed as a brushing glaze, is on the right. This is not sold in jars, I make my own labels as part of the demonstration that it is possible to make your own brushing glazes (ink-jetted onto regular paper, cut 62mm wide (2 7/16") and held securely on with 2 7/8" transparent packing tape). This glaze is less runny but lacks some of the floating white colouration. But that can be achieved using Alberta Slip floating blue L4655, it employs titanium instead of rutile (and relies on the rutile/iron mechanism for the blue color).

Rutile blue cone 6 glaze: Fast vs slow cool firing


Rutile blue glaze cooled fast and slow

Same clay body: Plainsman Coffee Clay. Same glaze: MA6-C rutile blue. But the mug on the left was fired in the PLC6DS schedule (normally that one does not produce this much blue, but the heavily pigmented clay brings it out). The one on the right was fired in the C6DHSC schedule. That schedule also improves the gloss and surface quality of the inside GA6-B liner glaze.

Crystallization of this glaze gives insight into why it can host the floating blue effect


Crystallization of a floating blue base

These two mugs have the Alberta Slip base cone 6 GA6-A glaze on the inside and GA6-C on the outside (it just adds rutile to GA6-A). The left one was cooled normally (kiln off at cone 6 after soak). For the mug on the right, the kiln was soaked for half an hour at 1800F on the way down to develop the rutile blue glaze on the outside. But during this period crystallization occurred on the inside also. This provides an insight into my this GA6-A base hosts floating blue effects but GA6-B does not: The amount of Al2O3 is much lower, that improves melt fluidity and acts as a catalyst for crystallization.

Links

Materials Rutile
A raw TiO2-containing mineral used in ceramics to color and variegate glaze surfaces.
Materials Titanium Dioxide
A super white powder used in ceramic glazes to variegate, opacify and moderate color.
URLs https://insight-live.com/insight/share.php?z=oLZXQTy9TR
Floating Blue - Substituting Gerstley Borate
Typecodes Floating Blue
A popular cone 6 glaze that employed Gerstley Borate, it was very troublesome to use and to fire. Much work has been done to create alternative recipes.
Glossary Rutile Blue Glazes
A type of ceramic glaze in which the surface variegates and crystallizes on cooling in the presence of titanium and iron (usually sourced by rutile)

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