Grobet Liver of Sulphur XL Gel (Grobet Liver of Sulphur XL Gel 2 oz.)

What the brand says

Liver of Sulphur XL Gel is formulated for extended shelf life, versatility & convenience XL Gel is used to patina metals such as silver, copper, bronze. XL Gel is non-flammable Newly designed squeeze bottle for easy dispensing. XL Gel's shelf life is many times that of dry liver of sulphur Shake XL Gel before use for consistent results May be microwaved for no longer than 15 seconds.