When creating outline solids, what is used to indicate the edges of shapes clearly?

Using dark lines to indicate the edges of shapes is essential in graphic communication as it provides clarity and visual impact. Dark lines stand out against lighter backgrounds and help delineate the boundaries of the shapes effectively, making them easier for the viewer to identify and understand the overall form of the design. This enhances the legibility of technical drawings and sketches, ensuring that the outline solids are distinct and easily recognizable.

In contrast, dimensional lines are primarily used to indicate measurement and scale rather than to define the shapes themselves. Thin dotted lines typically signify hidden lines or alternate edges, which do not provide a strong definition of the shape’s outline. Colored lines can be used to convey information such as different materials or components, but they may not always provide the necessary clarity and emphasis that dark lines do when outlining shapes. Therefore, for the purpose of clearly indicating the edges of shapes in graphic communication, dark lines are the most effective choice.