A Riot of Effects
Simple layup + reactions = a riot of effects
What’s going on in this glass? Our piece may look complex, but the colorful effects resulted from just allowing and preventing two types of reactions: sulfur + copper and sulfur + silver.
Because uncapped metal foil reactions can spread out and travel, they may contaminate the kiln shelf and affect future firings, even if the shelf is properly scraped and reprimed. Shelf contamination may or may not be visible and can even occur through ThinFire or fiber paper. Contamination is not permanent, but several firings may be needed to adequately burn it out. Consider designating a shelf specifically for firing metal foils.