Which of the following is a sign of potential asbestos presence?

Old pipe insulation is a significant indicator of potential asbestos presence due to the historical use of asbestos in insulation materials, particularly in pipes and ducts. During the mid-20th century, asbestos was widely utilized for its excellent thermal insulation properties and resistance to fire. If a building was constructed or renovated during this period, any old pipe insulation found may very well contain asbestos, making it important to handle with care.

In contrast, brightly colored paint does not suggest asbestos presence, especially since modern regulations have significantly limited the use of hazardous materials in residential and commercial paints. Newer electrical wiring typically adheres to current safety standards where asbestos isn't used. Similarly, modern roofing materials are less likely to contain asbestos, as the use of asbestos in roofing has been largely phased out in favor of safer alternatives. Thus, the presence of old pipe insulation is a critical sign that indicates the potential for asbestos, warranting further investigation and assessment by trained professionals.