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Dyer's kermes (Kermes vermilio) is found only on the kermes oak (Quercus coccifera L). They were used in the past for the preparation of dyes for textiles and as a pharmaceutical. The main constituents of this insect are kermesic acid (ka) and flavokermesic acid (fk). Historically and culturally important dyer's kermes insect red dyes were investigated by high performance liquid chromatography. Kermes in the Northwest of Turkey were analyzed first time the relative amount of the dyestuffsdoi:10.2478/auoc-2019-0001 fatcat:iwxjxsydgjdmbaptvvvojty4y4