This ink sample was tagged with rare
earths La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in the form
of their thenoyltrifluoroacetonate complexes in such a way that the
approximate concentration of these rare earths in the ink sample was
500 ppm [3].
This ink sample was tagged with rareearths La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in the formof their thenoyltrifluoroacetonate complexes in such a way that theapproximate concentration of these rare earths in the ink sample was500 ppm [3].
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