When exposed to flames or electric arcs, which of the following should clothing not do?

The correct answer highlights the importance of flame-resistant clothing characteristics. Clothing that continues to burn after the heat source is removed can pose a serious risk to individuals working near flames or electric arcs, as it can lead to extended exposure and severe burn injuries. Flame-resistant fabrics are designed to self-extinguish when the heat source is removed, reducing the likelihood of injury in hazardous situations.

The other options, while they may pertain to safety or visibility, do not address this critical aspect of clothing performance in fire-related scenarios. For instance, insulation is essential for some protective gear but does not necessarily relate to the burning characteristics of the fabric. Bright colors are often used for visibility in work environments but do not inherently protect against burns. Lastly, loose-fitting clothing can sometimes be hazardous as it may get caught in machinery, but again, this does not specifically address the risk of burning.