Low in halogenated compounds and sulfur allows use in many stainless steel, nuclear and other corrosion sensitive applications. Specifications vary by color. For typical halogenated compound and sulfur levels for Each color. Silver paint markers contain low halogens. Leaves permanent, clear marks through a wide variety cutting oils and soapy lubricants, rust preventive coatings and other types of hydrocarbon coatings. Can be used on most types of coated metal surfaces including powder coating, rust protectants, PVC plastics and epoxies. Writes on surfaces and in air temperatures as cold as 50 degrees_fahrenheit below zero with a clear, permanent mark.