Alberta Slip Ravenscrag Slip Textured Engobe G2934 Matte Cone 6 Base Glaze G2926B Cone 6 Transparent Whiteware Base Glaze GA6-A Alberta Slip Cone 6 Base Glaze L3954B Mid Temperature Engobe Zero3 K Transparent Glaze Zero3 Engobe G1947U Cone 10 Transparent Glaze G2571A Cone 10 Dolomite Matte Glaze GR10-A Ravenscrag Cone 10R Base Glaze
GA6-A Alberta Slip Cone 6 Base Glaze
The base cone 6 glaze recipe for Alberta Slip, it adds 20% frit to produce a well-melted amber transparent. It is very useful itself as a cover and liner glaze and can become much more if slow cooled (to form surface crystallization) and with additions (e.g. to form cobalt-free floating blue).
Transparent glaze of choice for dark bodies
The amber color and micro-bubble-free matrix make this work so well.
Clear glazes often do not work on dark bodies. The center mug is clear-glazed with G2926B (and is full of bubble clouds). This dark body (M390) is exposed inside and out (the other two mugs have a white engobe inside and midway down the outside). G2926B is an early-melter (starting around cone 02) so it is susceptible to dark-burning bodies that generate more gases of decomposition. Left mug: The outside glaze adds 4% iron to G2926B (the glaze was not screened, so iron particles are agglomerated and acting as a fining agent, removing the bubbles). Right mug: The whole thing is glazed with GA6-A Alberta Slip base glaze (but using Ferro Frit 3195 instead of 3134). These amber glazes have an added benefit: The color darkens over dark burning bodies (to almost black).
Coffee Clay fired at cone 6 with transparent glazes. The Alberta Slip GA6-A glaze (left) is clearly better that the G2926B on the right. This firing is schedule C6DHSC, a 100F/hr slow cool to 1400F. The glaze is the right certainly has fewer bubbles than normal, but still is not nearly as good as the one on the left.
The GA6-A glaze on the insides of these mugs has crystallized during cooling (normally it is a transparent amber). This happened because we programmed the firing to drop at 150F/hr down to 1400F (the GA6-C blue requires it). You can prevent the crystallization during slow cooling by adding 1% tin oxide to the recipe.
You can find the home page for this recipe at digitalfire.com by clicking the following: GA6-A. And the cone 6 glaze page at http://albertaslip.com has all kinds of variations (additions of colors, variegators, opacifiers) that can be made.
Alberta Slip as a celadon at cone 6 (left), cone 10R (right). The left recipe is just the base GA6-A with Frit 3195 on Plainsman M370. The other is Alberta Slip/Ravenscrag Slip 50:50 mix on Plainsman P700.
Safety Data SheetClick here for web view.
|Plainsman Clays Ltd.|
702 Wood Street, Medicine Hat, Alberta T1A 1E9
Phone: 403-527-8535 FAX:403-527-7508