Modification Date: 2016-10-20 14:50:07
Member of Group: RV6
A stain-based method to achieve this color using the Ravenscrag base recipe.
|Calcined Ravenscrag Slip||40.0||36.4%|
|Ferro Frit 3134||20.0||18.2%|
|Mason 6006 Stain||10.0||9.1%|
This is an excellent alternative to the GR6-E Raspberry because the recipe is simpler, just a stain addition to the standard transparent. It is easy to adjust the amount of frit to get the exact shade you want.
Because this is transparent (contains no opacifier), different thicknesses have different intensities of color. Because it employs a stain it will be very more consistent that one using chrome and tin. Add an opacifier to create a more pastel color with less depth.
No special firing curve is needed and the surface fires very clean and defect free (with a normal soak at cone 6).
This is the Ravenscrag slip cone 6 base (GR6-A which is 80 Ravenscrag, 20 Frit 3134) with 10% Mason 6006 stain. Notice how the color is white where it thins on contours, this is called "breaking". Thus we say that this glaze "breaks to white". The development of this color needs the right chemistry in the host glaze and it needs depth to work (on the edges the glaze is too thin so there is no color). The breaking phenomenon has many mechanisms, this is just one. Interestingly, this transparent base has more entrained micro-bubbles than a frit-based glaze, these enhance the color effect.
This is GR6-L Ravenscrag Burgundy on porcelain at cone 6. The amount of stain is higher than usual (about 13% instead of 10%), thus the color is darker.
The stain has been cut to 10% giving the glaze more transparency and making it vary more in color with changing thickness.
The body on the left has 10% burnt umber adding (Plainsman M340) and fires chocolate brown (right is standard M340). The manganese (in the umber) is greatly affecting the appearance of the glaze (GR6-L).
Out Bound Links
This Plainsman Cone 6 Ravenscrag Slip base it just the pure material with 20% added frit.
2003-07-21 - This is the base cone 6 Ravenscrag recipe, it fires as a transparent glossy (with some variegation from coarser particles that produce some fine speck...
A chrome-tin burgundy glaze using the Ravenscrag cone 6 base recipe.
2005-02-21 - Chrome-tin (either from the raw materials or a stain) pink and red glazes can be difficult to achieve and keep consistent at cone 6. In ceramics, red ...
By Tony Hansen+