What was the industry standard for residential lead-based paint in 1955?

In 1955, the industry standard for lead content in residential lead-based paint was established at 1%. This level was considered acceptable for residential use at that time, as there was limited awareness of the health risks associated with lead exposure. The recognition of lead's toxicity and its harmful effects on health, particularly in children, was not as prominent in the mid-20th century.

Other options, while they represent varying lead content levels, did not reflect the standard set in 1955. A lower percentage, such as 0.5% or 0.06%, suggests a much stricter limitation that was not in place during that era. Similarly, a higher percentage like 2% would exceed the acceptable levels established by regulations of that time, as these levels were based on prevailing health guidelines that later evolved with increased understanding of lead's dangers.