Tapes

Barricade tape is brightly colored tape (often incorporating a two-tone pattern of alternating yellow-black ) that is used to warn or catch the attention of passersby of an area or situation containing a possible hazard. The tape is often wrapped and affixed as a visual warning sign and demarcation, for instance against entering a dangerous area, such as an industrial or commercial building site, a road works construction site or the scene of an accident or a crime (for crime scene preservation), or against handling inoperative machinery or appliances. The choice of colours of barricade tape depends on the contrast with its background, which in the case of the sky, can vary from black to white. To have a reasonable change of being visible against most backgrounds, the tape needs a light colour (white or yellow) and a darker colour