Among the evidence found at the crime scene, blood, sweat, paint, ink, etc. are the most frequently encountered forensic science evidence among the many liquid evidence circulating in the crime scene. Or it plays a decisive role in the reconstruction of the situation between the suspect, the victim and the suspect, causal relations, and the tracking of vehicles for escape. Up to this point, biological traces (bloodstain, semen, sweat, saliva, urine), which were considered important for DNA testing, were analyzed in the near ultraviolet (300-400nm) and blue (450nm) wavelength bands through many previous studies. Fluorescence reaction occurs on stains, etc., and has been found to be useful for blood stain observation in the 415nm wavelength range. However, due to the development of the current DNA testing technology, it has become possible to detect DNA in other liquids or in finer and older evidence. For this purpose, it is necessary to establish a legal light source DB in a broader meaning, not relying only on the fluorescence reaction by a specific wavelength band. Although this has emerged, studies on this have been insufficient so far. This study used a total of 157 samples of 5 types of fibers (red, yellow, green, blue, white) and 5 types of liquid samples (beverages, pens, paints, paints, etc.). And confirmed the identifiable wavelength range of the liquid sample in the fibers of similar color. As a result, when a specific wavelength band and filter were applied from a liquid sample of the same color oiled in each color fiber, it was confirmed that samples that were not visible when observed with the naked eye in natural light were identified. Through this, it is expected that the luminescence characteristics of liquid evidence and the selective use of identifiable wavelength bands and filters can help to quickly detect the scene at the crime scene or accurately assess the fiber evidence at the test center.