Colour Interval Value Publication Food Name Reference
[ 0.02, 0.03 ) 0.02 mg/100 ml Coffee C Lang R., et al (2006) Development of a stable isotope dilution.... Journal of Agricultural and Food Chemistry 54:5755-5762 PubMed (16881674)
[ 0.04, 0.06 ) 0.04 mg/100 ml Coffee B Lang R., et al (2006) Development of a stable isotope dilution.... Journal of Agricultural and Food Chemistry 54:5755-5762 PubMed (16881674)
0.05 mg/100 ml Coffee A Lang R., et al (2006) Development of a stable isotope dilution.... Journal of Agricultural and Food Chemistry 54:5755-5762 PubMed (16881674)