Method for marking liquids with at least two marker substances and method for detecting them

本发明涉及用至少两种标记物标记液体的方法，其特征在于，所述标记物在600-1200nm光谱区域吸收并因此再发射荧光，且至少一种标记物的吸收范围与至少另一种标记物的吸收范围重叠。本发明还涉及检测依据本发明方法标记的液体中标记物的方法。该方法的特征在于，所用放射源在标记物的吸收范围内发射放射线，从而可检测所述标记物发射的荧光，其中至少一个放射源在至少一种标记物与至少另一种标记物的重叠吸收范围内发射放射线，并且放射源的数目少于或等于标记物的数目。本发明还涉及依据本发明方法标记的液体。 The present invention relates to a method of marking liquids using at least two markers, wherein said markers absorb in the 600-1200 nm region of the spectrum and reemit fluorescent light and the absorption range of at least one marker overlaps with the absorption range of at least one other marker.The present invention further relates to a method for detecting markers in liquids marked by the method of the invention, which comprises using light sources which emit radiation in the absorption ranges of said markers and detecting the fluorescent light reemitted by said markers, at least one of said light sources emitting radiation in the overlapping absorption range of at least one marker with that of at least one other marker and the number of light sources being less than or equal to the number of markers.The present invention further relates to liquids marked by the method of the invention.