# The Pencils and Graphic Instruments (Safety) Regulations 1998, Paragraph 1


In the case of a sample (other than a sample of coating) containing any wax, oil or other similar matter, that wax, oil or matter shall first be removed using n-heptane.

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Source: https://www.legislation.gov.uk/uksi/1998/2406/schedule/paragraph/1 (the official version)
Page: https://openlegislation.uk/pencils-and-graphic-instruments-safety-regulations-1998/schedule/paragraph-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.