|Monthly Tech-Tip |
Modified: 2022-10-31 13:55:48
Plainsman Cone 6 Ravenscrag Slip based white glossy glaze. It can be found among others at http://ravenscrag.com.
|Ravenscrag Slip 1000F Roast||40.00|
|Ferro Frit 3134||20.00|
A white base glaze with all the advantages of Ravenscrag Slip base GR6-A. It is not drab-looking like a porcelain toilet, but is vibrant and interesting on stoneware bodies. It breaks to clear on the edges of contours and has variegation. It works well with added stains, the variegation of this base (adding a little titanium dioxide) makes the color much more interesting.
Adjust the amount of zircopax as needed to adjust the degree of whiteness. Recently we have begun using a mix of tin and zircopax (3% and 5%) to minimize crawling.
Because it contains an opacifier, this can be a base for the addition of colorants to produce pastel colors (adding them to the transparent base will produce deeper more brilliant colors). We recommend stains rather than metal oxides.
For mixing instructions please see the master recipe, GR6-A.
Consider using G2926B clear with added Zircopax if this recipe does not produce the degree of whiteness and homogeneity you need.
Right: Ravenscrag GR6-A transparent base glaze. Left: It has been opacified (turned opaque) by adding 10% Zircopax. This opacification mechanism can be transplanted into almost any transparent glaze. It can also be employed in colored transparents, it will convert their coloration to a pastel shade, lightening it. Zircon works well in oxidation and reduction. Tin oxide is another opacifier, it is much more expensive and only works in oxidation firing.
The body is Plainsman M340 and these two glazes are based on the GR6-A recipe (Ravenscrag Slip + 20% frit). The GR6-C creamy white glaze adds 10% Zircopax to opacify it. The pink version, our code number GR6-L, adds Mason 6006 stain instead. The GR6-A base is zinc-free and just hits the 10% minimum CaO recommended to get color development with a chrome tin stain. This recipe also couples a low MgO level (MgO can kill the color in chrome tin stains).Tap picture for full size and resolution
Plainsman Cone 6 Electric Standard
Used in the Plainsman lab to fire clay test bars in our small kilns
Ravenscrag Slip Recipes
Recipes based on Ravenscrag Slip from Plainsman Clays.
Medium Temperature Glaze Recipes
Normally fired at cone 5-7 in electric kilns.
GR6-A - Ravenscrag Cone 6 Clear Glossy Base
This Plainsman Cone 6 Ravenscrag Slip base is just the pure material with 20% added frit to make it melt to a glossy natural clear.
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|By Tony Hansen|
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