BLACK LIGHT Main function: identify the world notes true and false, ... . BLACK LIGHTDetector portable hand-held lights here, put 4W UV lamp, electric lighting in the top with beads. To ... Qingbaikouan paper has a strong reflected light. 3, counterfeit money or logo watermark exposure to head clear, no real currency.the ... and negative on the 5th, in the case of light the dark, that is, replace the battery ...