What is a key feature of OSHA-required pictograms?

A key feature of OSHA-required pictograms is that they must include a red frame. This red border is essential as it enhances visibility and signifies that the symbol represents a specific hazard associated with the chemical. The use of the red frame, along with related hazard symbols, helps ensure immediate recognition of potential dangers by employees, providing a critical visual cue that supports workplace safety.

The other choices do not align with OSHA’s designated standards for pictograms. While colors are an important aspect of the pictograms, the requirement specifically focuses on the red framing, rather than just any colored shades. Pictograms do not incorporate numbers or letters in their design; their purpose is to convey information visually through symbols. Additionally, there is no requirement for pictograms to include a bar graph, as this would not effectively communicate the necessary hazard information in the simplified manner intended by OSHA regulations.