(f)Prominent notices in the language understood by the majority of the workers and legible by day and by night, prohibiting smoking, the use of naked lights, and the carrying of matches or any apparatus for producing a naked light or spark, shall be affixed at the entrance of every room or place where is the risk of fire or explosion from inflammable gas, vapour or dust. In the case of illiterate workers, the contents of the notice shall be fully and carefully explained to them when they commence work in the factory for the first time and again when they have completed one week at the factory.
