Final answer:
The statement that 'Pastel paintings and crayon drawings should always be dry mounted' is false. The appropriate method of mounting art depends on the medium and the artwork's specific needs.
Step-by-step explanation:
The statement 'Pastel paintings and crayon drawings should always be dry mounted' is false. While it is essential to take care when mounting and preserving these types of artworks, dry mounting is not always the appropriate method. Pastel artworks, such as Pablo Picasso's 'Portrait of the Artist's Mother,' often require a more delicate handling because the pastel pigment, which is very soft and chalky, can easily be damaged. Paper used for pastels often has a 'tooth' to hold the dry pigment. Moreover, modern pastels might be fixed with a spray-on acrylic to keep the pigment in place.
Alternatively, some drawings use wet media and blurring the lines between drawing and painting. However, the defining aspect of a drawing is not the media but its linear quality. The appropriate mounting method depends on the specific medium's characteristics and the artwork's conservation needs. Therefore, each artwork should be evaluated individually to determine the best preservation technique.