# The Patents Rules 2007, Paragraph 15


Drawings must comprise black lines and may be shaded where the shading assists in representing the shape of a thing provided that it does not obscure other elements of the drawing.

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Source: https://www.legislation.gov.uk/uksi/2007/3291/schedule/2/paragraph/15 (the official version)
Page: https://openlegislation.uk/patents-rules-2007/schedule-2/paragraph-15
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.