# The Air Navigation (Hong Kong) Order 1995, Paragraph 3


The letters constituting each group of marks shall be of equal height and they, and the hyphen, shall all be of the same single colour which shall clearly contrast with the background on which they appear.

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Source: https://www.legislation.gov.uk/uksi/1995/2700/schedule/1/part/B/paragraph/3 (the official version)
Page: https://openlegislation.uk/air-navigation-hong-kong-order-1995/schedule-1/part-B/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.