Colour Interval Value Publication Food Name Reference
[ 0.02, 0.02 ) 0.02 mg/100 ml Irish stout beer Hayes P., et al (1987) Comparison of electrochemical and ultrav.... Analyst 112:1205-1207 PubMed (3425922)
[ 0.03, 0.04 ) 0.03 mg/100 ml Beer, dark McMurrough I., et al (1984) Phenolic acids in beers and worts. Journal of the Institute of Brewing 90:181-187 PubMed (25664918)
0.03 mg/100 ml Beer, dark Vanbeneden N., et al (2006) Determination of hydroxycinnamic acids a.... Journal of Chromatography A 1136:237-242 PubMed (17109870)