Most UVA lamp applications, which use a wavelength of 365nm, can be categorized as fluorescence or curing. Fluorescence is the conversion of UVA energy to a visible wavelength by materials such as paints, pigments, or minerals. Uva Fluorescent Lamp used for such applications are recognized as blacklight because the lights themselves appear dark, but when shined on various objects, they emit a variety of visible colors. 365nm UVA Lighting Tube can be used by law enforcement officials to identify the authenticity of money. The United States and many other countries have used an invisible fluorescent strip on their large denominations, which are only shown under black light.