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Alberta Slip Cone 6 Amber Base Glaze

Code: GA6-A
Modification Date: 2018-12-02 19:58:16
Member of Group: AS6

An amber-colored glaze that produces a clean, micro bubble free transparent glass on brown and red burning stonewares.

MaterialAmount
Alberta Slip 1000F Roasted40.0
Alberta Slip40.0
Ferro Frit 313420.0
 100.00  

Firing Schedule

Rate (F)Temp (F)Hold (Min)Step
100220601
300173302
1082195153
1502095304

Notes

This is the base cone 6 Alberta Slip recipe. The 20% frit makes it melt well to form a transparent amber glossy.

Frit 3134 has traditionally been used and it is the best for some additions (e.g. rutile for floating blue). However we recommend Frit 3195 when possible, it imparts a lower thermal expansion for better fit (less crazing). For use on P300 we recommend Ferro 3249 (or Fusion F-69) for the lowest possible thermal expansion.

This base can be used as-is (with no colorant or variegator additions). It is most useful to replace regular transparent glazes on dark-burning clays (to avoid issues with micro bubble clouding). If not cooled slowly, the effect is a very clean, speck free amber transparent glossy that showcases the dark body color below. On light-burning clays and even porcelains, celadon green effects can be produced.

However, if this glaze is cooled slowly (which often happens in heavily loaded kilns) it will form surface crystals. These can produce beautiful effects (depending on cooling speed) that normal clear glazes having added iron oxide powder will normally do. For consistency in appearance it will be necessary to program the descent of your firings to match the slowest natural descent you normally get. Then, on that baseline, you will be able to depend on consistent results. By adding 1% tin oxide you can prevent crystallization (see photo below).

This recipe is excellent base for additions and many of these are documented on the cone 6 glazes page at http://albertaslip.com. Glossy brown to black colors require much less stain than does a standard clear base glaze. Reactive rutile and titanium effects that depend on the presence of some iron also react really well with this base.

As noted above, assess the fit with your clay body to be sure there is no tendency to craze (by stressing ware using a 300F-to-icewater IWCT test ice). If crazing occurs switch to frit 3195 (GA6-B). If it still occurs (e.g. with a porcelain), switch to frit 3249. Note again: While these frits still produce the glossy amber transparent effect they may not react the same with colorants, especially the rutile blue.

In our lab we can make one Canadian gallon using a mix of 2700 water and 3000 powdered glaze mix (1200 Alberta Slip, 1200 Calcined Alberta Slip, 600 Frit). This produces a specific gravity of 1.45 at about the right viscosity (and thixotropy) for dipping. We add a 1-2 grams of Epsom Salts to this to gel the slurry a little for better application properties. A 1-2 second dip in 1850F bisque ware produces the right thickness for us. While you certainly can mix to a higher specific gravity (thus using less water), be careful as this will often make it go on too thick (and cracking will likely occur).

Do not go higher that the above-recommended specific gravity or it is likely the glaze will go on too thick. Dip ware quickly as well (to avoid it going on too thick).

Out Bound Links

In Bound Links

XML to Paste Into Insight

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By Tony Hansen




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