What type of line would typically appear bolder in drawings?

The outline solid line is generally used in drawings to represent the visible edges of an object. This type of line is made to be bolder to emphasize the main features and contours of the drawing, making it clear and distinct from other types of lines that may convey different information. Having a bold outline helps viewers to quickly recognize the shape and outline of the object being drawn, enhancing clarity and focus in technical drawings and illustrations.

In contrast, projection lines are typically lighter as they indicate points of reference and are not meant to dominate the drawing; dashed lines are used to represent hidden features or edges that are not visible and thus are less prominent; construction lines are usually very light and are employed for guiding purposes in the drafting process and can be erased later, leaving no lasting impression on the final drawing. Thus, the boldness of the outline solid line serves a specific function in communicating the essential aspects of a drawing more effectively.