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Ravenscrag Alberta Brilliant Cone 6 Celadon

Code: GR6-N
Modification Date: 2016-09-30 22:47:35
Member of Group: RV6

Plainsman Cone 6 Ravenscrag Slip based glaze. It can be found among others at http://ravenscrag.com.

MaterialAmountPercent
Ravenscrag Slip38.036.2%
Alberta Slip Calcined38.036.2%
Ferro Frit 313419.018.1%
Ferro Frit 31245.04.8%
Iron Oxide Red1.01.0%
Cobalt Oxide0.50.5%
Rutile2.52.4%
Tin Oxide0.50.5%
Copper Oxide Black0.50.5%
 105.00  

Notes

This was originally discovered as a 50:50 mix of G2917 Ravenscrag Floating Blue and G2908 Alberta Slip Floating Blue. The result is green.

Alberta Ravenscrag Cone 6 Brilliant Celadon

Alberta Ravenscrag Cone 6 Brilliant Celadon

The magic of this recipe is the 5% extra frit, that makes the melt more fluid and brilliant and gives the glaze more transparency where it is thinner on edges and contours. The extra iron in the Plainsman P380 (right) intensifies the green glaze color (vs. Polar Ice on the left). The specks are cobalt oxide agglomerates that were made by slurrying cobalt oxide and bentonite, then crushing it to sizes large enough to make the specks.

Cone 10R celadon at cone 6? Ravenscrag:Alberta GR6-N recipe.

Cone 10R celadon at cone 6? Ravenscrag:Alberta GR6-N recipe.

Brilliantly glossy. The body is Plainsman Polar Ice porcelain. Firing is cone 6 oxidation. The reduction fired effect is particles (or agglomerates) from one of the raw metal oxides in the recipe (iron, cobalt, rutile; most likely the cobalt). If this glaze were ball milled the effect would be lost. Even though the glaze is so glassy, it is not running down off at the foot. The blue where it thickens on contours is because of the rutile, this can be removed for a truer Celadon effect (if it is not causing the specks).

A fluid melt glaze bleeds much more into adjoining ones

A fluid melt glaze bleeds much more into adjoining ones

The outer green glaze on these cone 6 porcelain mugs has a high melt fluidity. The liner glaze on the lower one, G2926B, is high gloss but not highly melt fluid. Notice that it forms a fairly crisp boundary with the outer glaze at the lip of the mug. The upper liner is G3806C, a fluid melt high gloss clear. The outer and inner glazes bleed together completely forming a very fuzzy boundary.


By Tony Hansen

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