Laboratory safety is a very important aspect of science. Without it, experimentation could result in very serious injury. Thin Layer Chromatography is very useful to chemists as an analytical technique to separate and identify the compounds in a mixture using chromatograms. In this technique, the chromatograms must be detected under ultraviolet lamp. The design and working of a new unit, protected ultraviolet cabinet, is presented in this paper. This unit can be used for easy viewing and marking of chromatograms and also for safe laboratory.