# Commission Regulation (EEC) No 2568/91 of 11 July 1991 on the characteristics of olive oil and olive-residue oil and on the relevant methods of analysis, Division 5.3: Determination

Extent: E+W+S+N.I.

Dissolve the sample (5.2) in 50 to 100 ml of the previously neutralized mixture of diethyl ether and ethanol (3.1).
Titrate while stirring with the 0,1 mol/l solution of potassium hydroxide (or sodium hydroxide) (3.2) (see Note 4) until the indicator changes (the colour of the coloured indicator persists for at least 10 seconds).
Carry out a second determination only if the first result is higher than the specified limit for the category of the oil.

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Source: https://www.legislation.gov.uk/eur/1991/2568/annex/II/division/5/division/5.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-1991-2568/annex-II/division-5/division-5.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.