1313.3 Drawing Deposit Requirements
If the applicant submits deposit material that contains drawings, the deposit material must satisfy the following requirements:
• Only black ink is acceptable;
• The drawing must be submitted on 8 ¬Ω inches by 11inches unruled paper;
• The drawing must contain the appropriate amount of surface shading to clearly show the character and contour of all surfaces of any three-dimensional aspects of the design; and
• Surface shading should not be solid black, unless that depicts the color black in the design.
37 C.F.R. § 212.3 (E) (3).