A team from the Food Industry Higher Institute in Plovdiv will prepare an isotopic map of the Bulgarian rose fields, classifying them in terms of variety, quality and age. The isotopic analysis of the rose petals will provide reference for the identification of the origin of the rose petals. Over the last couple of years, delinquent traders have been mixing Bulgarian rose petals with petals of inferior quality from Iran and Turkey and the new map aims to put an end to that practice. Bulgaria produces some 2,500 tons of rose oil annually.