METHOD FOR MARKING LIQUID HYDROCARBONS BY USING AT LEAST TWO DYES FOR INCREASING FLEXIBILITY

摘要

PURPOSE: A method for marking liquid hydrocarbons by using at least two dyes is provided to increase the flexibility due to the mixing of dyes and to minimize the processing cost. CONSTITUTION: The method for marking liquid essential oil hydrocarbons comprises the step of adding, to the liquid essential oil hydrocarbons: (i) at least one anthraquinone dye selected from the group consisting of 1,4,5,8-tetrasubstituted anthraquinones and anthracene dimer and having a maximum absorption wavelength range of 710-850 nm; and (ii) at least one visible dye having a maximum absorption wavelength range of 500-700 nm.