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Code: GR10-J1
Modification Date: 2018-05-24 15:23:04
Member of Group: RV10
Plainsman Cone 10R Ravenscrag Slip based glaze. It can be found among others at http://ravenscrag.com.
| Material | Amount | |||
| Ravenscrag Slip | 51.6 | 51.1% | ||
| Dolomite | 12.1 | 12.0% | ||
| Talc | 2.6 | 2.6% | ||
| Gerstley Borate | 4.0 | 4.0% | ||
| Calcined Kaolin | 13.5 | 13.4% | ||
| Custer Feldspar | 16.2 | 16.0% | ||
| Additions | ||||
| Red Iron Oxide | 1.0 | 1.0% | ||
| 101.00 | ||||
This is GR10-J dolomite matte (a Ravenscrag version of G2571A) with 1% iron oxide added (to produce a bamboo effect).
An alternative bamboo (for both this and the G2571A recipe) is to add 3.5% rutile and 10% zircopax.
Make cone 10R bamboo colors using the GR10-J Ravenscrag silky matte base recipe (right) and adding 1% iron (left), (0.5% centre). These samples are porcelain. This iron addition also works using the G2571A matte base recipe.
Porcelain (left), buff stoneware (center), iron stoneware (right). Works well on all body types. On porcelain, interesting red tones and variations in tone appear.
The stunning cone 10R Ravenscrag bamboo glaze (GR10-J plus 0.5% iron oxide) on a Grolleg porcelain. Up close it can feel and look like a fine wood surface (when used on a porcelain). The cone 10 recipes page at Ravenscrag.com has more info.
These mugs are Plainsman H443. The bamboo glaze on the left (A) has 3.5% rutile and 10% zircopax added to the base G2571A dolomite matte. The one on the right (B) has the same addition but in a base having slightly less MgO and slightly more KNaO. B stains badly (as can be seen from the felt marker residue that could not be removed using lacquer thinner). Why does A stain only slightly? It has an additional 4% Gerstley Borate (GB). GB is a powerful flux that develops the glass better, making the surface more silky. The differences in the recipe provide another advantage: A has a much lower thermal expansion and is less likely to craze.
These mugs are Plainsman H450. Both have a black engobe (L3954N) applied to the insides and half way down the outside during leather hard stage (the insides are glazed with Ravenscrag silky matte and G1947U over the black engobe). The bamboo glazes can thus be seen over the black (upper half) and the raw buff body (lower). The bamboo glaze on the left has 1% iron added to the base G2571A recipe. The one on the right has 3.5% powdered rutile and 10% zircopax added.
Out Bound Links
Plainsman Cone 10R Ravenscrag Slip based glaze. It can be found among others at http://ravenscrag.com.
2011-08-02 - This is the classic cone 10 reduction silky white matte, its feel, beauty and utility are very difficult to match in any other system. Unlike many fel...
In Bound Links
Usually describes a bamboo colored matte glaze (especially in reduction stoneware). These are normally achieved in a magnesia white matte by adding a small amount of iron (0.5-1%) and possibly some tin oxide opacifier.
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<recipe name="Ravenscrag Cone 10R Bamboo Matte" keywords="Plainsman Cone 10R Ravenscrag Slip based glaze. It can be found among others at http://ravenscrag.com." id="108" date="2018-05-24" codenum="GR10-J1">
<recipelines>
<recipeline material="Ravenscrag Slip" amount="51.600" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Dolomite" amount="12.100" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Talc" amount="2.600" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Gerstley Borate" amount="4.000" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Calcined Kaolin" amount="13.500" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Custer Feldspar" amount="16.200" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Red Iron Oxide" amount="1.000" unitabbr="kg" conversion="1.0000" added="1"/>
<url url="https://digitalfire.com/4sight/recipes/ravenscrag_cone_10r_bamboo_matte_108.html" descrip="Recipe page at digitalfire.com"/>
</recipelines>
<urls/>
</recipe>
</recipes>
By Tony Hansen 
