Reactive Potential :
Silver
Cold Characteristics
Unfired sheet has a faint blue tint.
Working Notes
Upon firing, silver foil turns a golden color wherever it is in
contact with (001015) Alchemy Clear. On the sample tile
above, the left side illustrates silver foil after being fired
uncapped on top of (001015). The sample’s right side
illustrates silver foil after being fired between a layer of
Clear (any style) and (001015), with (001015) as the cap.
(Faint blue color may be evident in any fired work containing
001015.) Expect variations in effects to result from different
sources and thicknesses of silver, glass production runs,
and heatwork (including firing times, temperatures, and
number of times fired). For color development, we
recommend a 1 hour soak at 1225ºF / 663ºC in the pre-rapid
heat section of a firing cycle.
Note: When firing silver foil in the kiln, be aware that the
silver reaction can travel across the glass surface and onto
the kiln shelf, potentially affecting silver-sensitive glasses
in one or more subsequent firings. This can happen even
when new shelf release (paper or primer) is applied to the
kiln shelf. When fired between layers, silver is generally
more contained and less likely to affect the firing surface.

REACTIVITY WITH RAINBOW IRIDESCENT COATING
Because iridescent coating acts as a barrier, don’t expect
much reaction when using silver directly against this coated
glass. That said, the silver might still make contact with the
glass through thinner sections of the iridescent coating—
resulting in pale gold effects caused by (001015)’s silver
reactivity. Results vary widely, both in terms of the effect’s
strength and color.