Some soft solders are "silver-bearing" alloys used to solder silver-plated items. Hard solders are used for brazing, and melt at higher temperatures. Lead-tin solders readily dissolve gold plating and form brittle intermetallics. New uses were found in fusible alloys, solders, and electronics. Tin pest can occur in lead-free solders, leading to loss of the soldered joint. Generally low levels of contaminates may include metals from the heating coils, solders, and wick. Conductive glass solders can be also prepared. She has contributed research in light alloys, lead-free solders, and hydrogen storage materials. Gold and palladium readily dissolve in solders. Devitrifying solders frequently contain up to 25% zinc oxide. Glass solders are available as frit powder with grain size below 60 micrometers. Such solders are primarily used for joining pipes or electric circuits. In silversmithing or jewelry making, special hard solders are used that will pass assay. Traditionally, lead was added to slow down whisker growth in tin-based solders. Its products include torches, fuel cylinders, kits, solders and accessories, and utility lighters.