The GR6-L (the two on the left) employs raw chrome and tin, the GR6-E uses a stain (Mason 6006). The L does not melt quite as well (because of the 10% whiting in the recipe to make sure it develops the chrome-tin color well). The GR6-E is does not need the whiting. The E is much more flexible because one can choose different stains to get different colors. Of course the intensity of the color can be adjusted by varying the percentage of colorant. And the L could be made to melt better by increasing the percentage of frit.
GR6-E - Ravenscrag Cone 6 Raspberry Glossy
A chrome-tin burgundy glaze using the Ravenscrag cone 6 base recipe.
GR6-L - Ravenscrag Cone 6 Transparent Burgundy
A stain-based method to achieve this color using the Ravenscrag base recipe.