AO | B1 | CE | F5 | F5-3NO-E1 | FO | G1214M | G1214W | G1214Z | G1215U | G1216L | G1216M | G1916Q | G1947U | G2000 | G2240 | G2571A | G2587 | G2826X | g2851H | G2853B | G2896 | G2902B | G2902D | G2916F | G2926B | G2926J | G2926S | G2928C | G2931H | G2931K | G2931L | G2934 | G2934Y | G3806C | G3838A | G3879 | GA10-A | GA10-B | GA10-D | GA10x-A | GA6-A | GA6-AR | GA6-B | GA6-C | GA6-D | GA6-F | GA6-G | GA6-G1 | GA6-H | GBCG1 | GBCG2 | GC | GR | GR10-A | GR10-B | GR10-C | GR10-E | GR10-G | GR10-J | GR10-J1 | GR10-K1 | GR10-L | GR6-A | GR6-B | GR6-C | GR6-D | | GR6-F | GR6-H | GR6-L | GR6-M | GR6-N | L2000 | L3341B | L3500E | L3617A | L3685U | L3724F | L3924C | L3954B | L3954N | P3998 | P5283 | TF | VS | WM | ZZ1

GR6-E - Ravenscrag Cone 6 Raspberry Glossy

Modified: 2019-03-13 15:00:37

A chrome-tin burgundy glaze using the Ravenscrag cone 6 base recipe.

Material Amount
Ravenscrag Slip*70.00
Ferro Frit 3134*20.00
Whiting*10.00
Added
Tin Oxide*7.50
Chrome Oxide*0.50
108.00

Notes

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 is perhaps the most difficult and most expensive color in ceramics. The chemistry of the host glaze has to be sympathetic to the color development, the chrome and tin require high calcium, zero zinc and low boron (if the chemistry is wrong the color will likely be grey). Glazes that do work in this system are normally highly fritted, and as such are more expensive and difficult to work with. However this Ravenscrag base has beautiful working properties, you can do multiple layers and it has all the other benefits imparted by a high Ravenscrag Slip content. However, keep in mind that red is red, it is difficult; test this first on different kinds of clay to determine if is is suitable for you. Again, remember that tin is expensive, it may be better to use a pink or maroon chrome-tin based stain instead (although they are not much lower in price).

Medium to medium thick application is best. Breaks clear around edges to highlight irregularities in the surface. On darker bodies the red color is darker. Slow cooling can matte the surface.

For mixing instructions please see the master recipe, GR6-A.

Cone 6 GR6-E Ravenscrag Raspberry glaze

Cone 6 GR6-E Ravenscrag Raspberry glaze

Made using chrome and tin added to the cone 6 Ravenscrag clear base glaze recipe.

What happens if Ravenscrag Raspberry is applied too thick

What happens if Ravenscrag Raspberry is applied too thick

These are Plainsman P300 mugs fired at cone 6. When the glaze, GR6-E, goes on too thick (as on the left) it is dark maroon and has a pebbly surface that does highlight contours. This went on too thick because the specific gravity of the slurry was too high, about 1.53 (even a one-second dip put to thick a layer on the pieces). When I thinned it down to about 1.45 and flocculated it using espom salts, it went on thinner, yet still evenly, and I got the result on the right.

Maroon and white mug before and after firing: What a difference!

Maroon and white mug before and after firing: What a difference!

The outer glaze is Ravenscrag GR6-E Raspberry, the bright maroon color is a product of the surprising interaction between the 0.5% chrome oxide and 7.5% tin oxide present. That small amount of chrome is only enough to give the raw powder a slight greenish hue, hardly different than the clear liner. While this color mechanism appears to be effective, it is delicate. A maroon stain is actually a better choice. It would fire more consistent would be less hazardous to use. And the raw glaze will be the same color as the fired one!

Chrome tin pinks are easier using a stain than chrome and tin

Chrome tin pinks are easier using a stain than chrome and tin

The Ravenscrag Slip based burgundy glaze on the outside of these mugs is made by fluxing Ravenscrag with 20% Ferro Frit 3134 and adding 10% Mason 6006 burgundy stain (actually these have a little less stain, about 8%). This stain works better than using raw chrome and tin. This glaze functions very well on porcelains and breaks white on the edges to highlight contours.

Ravenscrag Cone 6 GR6-C white and with 10% Mason 6006 stain

Ravenscrag Cone 6 GR6-C white and with 10% Mason 6006 stain

The body is Plainsman M340. This is a good alternative to trying to get a chrome-tin pink or maroon working.

Links

Recipes GR6-L - Ravenscrag Cone 6 Transparent Burgundy
A stain-based method to achieve this color using the Ravenscrag base recipe.
Recipes 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.
Typecodes Medium Temperature Glaze Recipes
Normally fired at cone 5-7 in electric kilns.
Typecodes Ravenscrag Slip Recipes
Recipes based on Ravenscrag Slip from Plainsman Clays.
Firing Schedules Plainsman Cone 6 Electric Standard
Used in the Plainsman lab to fire clay test bars in our small kilns

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Ravenscrag Cone 6 Raspberry Glossy" keywords="A chrome-tin burgundy glaze using the Ravenscrag cone 6 base recipe." id="78" date="2019-03-13" codenum="GR6-E">
<recipelines>
<recipeline material="Ravenscrag Slip" amount="70.000"/>
<recipeline material="Ferro Frit 3134" amount="20.000"/>
<recipeline material="Whiting" amount="10.000"/>
<recipeline material="Tin Oxide" amount="7.500" added="1"/>
<recipeline material="Chrome Oxide" amount="0.500" added="1"/>
<url url="https://digitalfire.com/recipe/78" descrip="https://digitalfire.com/recipe/78"/>
</recipelines>
<urls/>
</recipe>
</recipes>

By Tony Hansen


Tell Us How to Improve This Page

Or ask a question and we will alter this page to better answer it.

Email Address

Name

Subject

Message


Upload picture


Copyright 2008, 2015, 2017 https://digitalfire.com, All Rights Reserved