title: Properties of colour reference solutions of the European Pharmacopoea in CIE L*a*b* colour space.
abstract: The coordinates of CIE L*a*b* uniform colour space have been acquired from the transmitance spectra of colour reference solutions of European Pharmacopoeia (Ph.Eur.). Calculation of colour differences of these solutions from purified water deltaE* gave their values in the range between 0.7 (B9 solution) to 36 (Y1 solution) CIE units. Excluding red colour reference soulutions, deltaE* values did not depend on concentrations of colour compounds linearly. Small deltaE* values founded by the brown and brownish-yellow colour reference solutions of the lowest concentrations can possibly cause some problems of visual examination of the degree of coloration of liquids according to Ph.Eur.
authors.affiliation: Institute of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences, Palackého 1/3, 612 42 Brno, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Subert
authors.forename: O
authors.initials: O
authors.lastname: Farsa
authors.forename: Z
authors.initials: Z
authors.lastname: Gajdosová
mesh_terms: D003116:Color / Q000592:standards*; D005060:Europe; D007202:Indicators and Reagents; D010602:Pharmacopoeias as Topic; D012015:Reference Standards; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet
chemical_list: D007202:Indicators and Reagents; D012996:Solutions