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3,Change the output wavelength, multiple search if there is a new discovery. For the fingerprint manifest, it could be better to bring the evidence materials back to the laboratory to examine if possible; if not easy to carry back, using fluorescent powder, fluorescent magnetic powder or other method to manifest the fingerprints, brush color powder should be according to the characteristics of the powder and select excitation wavelength, one side we must observe, one side brush, if strong fluorescence background, interference fluorescence fingerprint, should change another kind of powder and excitation wavelength.
3,Change the output wavelength, multiple search if there is a new discovery. For the fingerprint manifest, it could be better to bring the evidence materials back to the laboratory to examine if possible; if not easy to carry back, using fluorescent powder, fluorescent magnetic powder or other method to manifest the fingerprints, brush color powder should be according to the characteristics of the powder and select excitation wavelength, one side we must observe, one side brush, if strong fluorescence background, interference fluorescence fingerprint, should change another kind of powder and excitation wavelength.
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