What color is typically used for biological contamination markers?

The correct answer is characterized by a blue background with BIO in red letters. This color scheme is specifically used to signify biological threats and contamination, adhering to the standard color-coding conventions established for hazardous material markers. The blue background aids in creating a clear and distinct visual cue that is easily recognizable, while the red lettering draws attention and emphasizes the urgency associated with biological hazards. This combination enhances the marker's visibility and ensures that personnel can quickly identify and respond appropriately to potential biological risks in their environment. In the context of safety and emergency response, proper use of these markers is crucial for effective communication and management of hazardous situations.