UV / Ultraviolet Keychain & Handheld LED Flashlights
... a deep purple color in addition to the invisible UV
light. For some uses, such as checking counterfeit money, we still recomend the pure UV
Photons as the visible purple light from the ... tracking sprays are available which will cause fresh blood to fluoresce under UV
light), the Purple Photon lights may work better than the pure UV
version as they have a lightly wider beam.