What colors are used on a sign for biological hazards?

The appropriate colors used on a sign for biological hazards are typically red and white. The red color signifies danger and alerts individuals to the presence of potential hazards, while white is used for contrast and clarity in the sign's design. This color scheme is designed to draw attention and clearly convey the risk associated with biological agents.

The use of red signifies a level of urgency and a need to exercise caution, which is vital in environments where biological hazards may pose serious health threats. Other color combinations, such as black and white or blue and red, are generally utilized for different purposes in signage and do not have the same association with biological hazards as the red and white combination does.