<prompt> Dried Semen stains on clothes identified by:SpectrometryUV raysInfrared raysLASER  <response>: B i.e. UV rays When examined under filtered ultraviolet UV light, seminal fluid semen show a fluorescence of bluish white colourQ, which is not specific as other albuminous materials such as nasal, leucorrhoeal discharges, detergents and stains of urine also fluoresce. 