What colors are used on a sign for Biological hazards?

The colors used on a sign for biological hazards are typically blue and red. In the context of safety signage, blue is often associated with information and guidance, indicating the presence of a hazard, while red is universally recognized as a warning color that signifies danger or the need for caution. The combination of these colors helps ensure that individuals can easily identify and understand the threat posed by biological hazards, which may include anything from infectious agents to toxic substances.

The incorrect options utilize different color pairings that do not align with established safety color codes for biological hazards. Green and black, for example, are not typically used for warnings but may indicate safety or operational information. Yellow and green are also more suited to caution and safety messages rather than the specific warning associated with biological risks. Red and blue, while they include the warning color red, does not convey the same universal message regarding biological hazards as the correct combination does.