National Marker Company sign with the legend âDANGER - EYE AND EAR PROTECTION REQUIRED IN THIS AREAâ is used to instruct the workers to wear eye and ear protection in potentially hazardous workspaces. The danger sign is commonly used in industrial facilities and construction sites to enforce safety standards. The use of white text on a red base with black text on a white base in clear, bold letters ensures high visibility and easy readability of the message. The danger signage has an NMC Sign Muscle coating to protect the text against fading, scratches, scuffing, mold, and moisture and complies with OSHA standard.