FLUX
Definition
Flux is a transparent enamel, generally colorless or faintly tinted, used to neutralize the deformations caused by enamelling.
Origin of the term
The word comes from the verb to melt. Like any enamel, flux is a glass powder that melts in the kiln to form a vitrified layer. Its transparency allows it to be applied without visually altering the piece.
Main function
Enamelling one side generates tensions that deform the metal plate during firing. Applied to the back of an enamel dial, flux balances these stresses on both sides of the plate and prevents it from warping.
Other applications
Flux also protects an already enamelled subject, when it is applied as a final layer over the decoration. It can also be applied directly onto the copper before the final enamelling, as a preparatory layer that helps the following enamels adhere.
Application
The flux is applied as a moistened powder, like the other enamels, then fired in a kiln at high temperature. Several successive layers and firings are often needed to obtain a stable surface, free of bubbles or defects.
See also
For the complete process, see Enamelling.
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