# First Commission Directive of 26 July 1979 laying down Community methods of analysis for testing certain sugars intended for human consumption (79/796/EEC), Division 4.1: Fehling's solution:

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

4.1.1. Solution A:
Dissolve 69·3 g of copper II sulphate pentahydrate (CuSO4.5H2O) in water and make up to 1 000 ml.
4.1.2. Solution B:
Dissolve 346·0 g of double sodium potassium tartrate tetrahydrate (KNaC4H4O6.4H2O) with 100·0 g of sodium hydroxide in water and make up to 1 000 ml. The clear solution should be decanted from a sediment that may form from time to time.
Note:
These two solutions should be stored in brown or amber bottles.

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Source: https://www.legislation.gov.uk/eudr/1979/796/annex/II/division/8/division/4/division/4.1 (the official version)
Page: https://openlegislation.uk/eu-directive-1979-796/annex-II/division-8/division-4/division-4.1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.