Same glaze, same stain percentages Yet two stains give completely different results

Tuesday 1st April 2014

• Left: A cone 6 matte glaze (G2934 with no colorant).


• Middle: 5% Mason 6006 chrome-tin red stain added.


• Right: 5% Mason 6021 encapsulated red stain added.

Why does the red color not develop in the center glaze? This host recipe does not have the needed insight-live.com/glossary/118">chemistry to develop the #6006 chrome-tin color (Mason Colors provide glaze unity formula guidelines: 6.7–8.4% CaO and avoiding MgO). This glaze recipe calculates to 9.8% CaO and 5% MgO. The MgO is the likely reason the red fails to develop. Yet this glaze produces excellent color with #6021 encapsulated stain (right). It isn't automatic that a strong red is achieved at just 5% encapsulated stain. The color is embedded in zircon crystals and aggressively melting KNaO, which this base recipe has very little of, attacks them and reduces color intensity.

Pages that reference this post in the Digitalfire Reference Library:

Mason 6021 Red Stain, G2934 - Matte Glaze Base for Cone 6, Formulating a Clear Glaze Compatible with Chrome-Tin Stains, Stain 6006, Mason Color A company open with information, Encapsulated Stain

This post is one of thousands found in the Digitalfire Reference Database. Most are part of a timeline maintained by Tony Hansen. You can search that timeline on the home page of digitalfire.com.