# The Egg Products Regulations 1993, Paragraph 7: Quality Control Procedures


(1) The colour shall be compared in an all-purpose Lovibond Comparator using a 25 mm cell.
(2) The reagents and procedure shall be checked by preparing two control tubes at the same time, and in the first of these the egg product shall be replaced with an equivalent amount of water and in the second the starch shall be replaced with an equivalent amount of water.
(3) In order to be satisfactory the first tube should be a deeper blue, and the second tube a lighter blue, than any shade on the disc.

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Source: https://www.legislation.gov.uk/uksi/1993/1520/schedule/2/paragraph/7 (the official version)
Page: https://openlegislation.uk/egg-products-regulations-1993/schedule-2/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.