The process of giving a second firing to a piece of biscuit ware after decoration, at a relatively low temperature of around 700° Celsius, in order to burn out any oil from the decorating medium and fix the colour to the surface before glazing.
Origin
Mid 19th century; earliest use found in The Leeds Mercury.
Definition of hardening-on in US English:
hardening-on
noun
Ceramics
The process of giving a second firing to a piece of biscuit ware after decoration, at a relatively low temperature of around 700° Celsius, in order to burn out any oil from the decorating medium and fix the colour to the surface before glazing.
Origin
Mid 19th century; earliest use found in The Leeds Mercury.