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Prinz ref 2069 battery powered shortwave UV test lamp 256nm wavelength for Phosphors of Great Britain Israel USA etc. Requires 4 x AA batteries (not supplied) For detecting Phosphor bands on stamps for best results we would recommend using the lamp in a darkened room, allowing you to see more clearly the difference between the Phosphor section and the normal paper of the stamp. Some Phophors also ;hold; onto the UV light, and emit an afterglow after the lamp is switched off.If you are working on Machin definitive stamps after 1991, when the design of the perforations;changed;you will also need a longwave lampDo not look directly into any shortwave ultra violet lamps |
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