Silver Foil Silver foil is 4.8 times thicker than the silver leaf. Foil is more durable and a lot easier to handle than the leaf. Silver foil is thin layers of precious metals which can be used in glass fusing or blowing to add brilliant, rich coloring. We have chosen the highest grade metals to achieve the most intense results. These metals can be fused either between layers or just applied to the top of a piece during a slump. Their temperature range 1000°F – 1450°F with the intense colors happening when they are applied at the low end of the firing range. Pure Quality Silver Foil (1.000/1.000) 25 leaves, 3 5/8″ x 3 5/8″ Precious metal FOIL is ideal for fusing and torch work.