This sign is made by the National Marker Company and features legend âCAUTION - FACE SHIELD REQUIRED WHEN CHANGING OR ADDING CHEMICALSâ. The legend instructs workers to wear a face shield while handling chemicals to protect themselves at labs and industrial locations. The face protection signage has black text on a yellow base. This OSHA compliant sign is graffiti proof, UV resistant and chemical resistant. This caution sign is designed for accident prevention. With NMC Sign Muscle coating, the sign is safe from moisture, fading, mold, scuffing, and scratches.