1. Analysis of Indian blue ballpoint pen inks tagged with rare-earth thenoyltrifluoroacetonates by inductively coupled plasma–mass spectrometry and instrumental neutron activation analysis 
S.D. Maind, S.A. Kumar, N. Chattopadhyay, Ch. Gandhi, M. Sudersanan 
Forensic Science International 
Volume 159, Issue 1, Pages (May 2006)
DOI: /j.forsciint
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2. Fig. 1
(a) Chemical structure of 2-thenoyltrifluoroacetone. (b) Chemical structure of rare-earth thenoyltrifluoroacetonate dihydrate chelates (where Ln: La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu).
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3. Fig. 2
Typical IR spectrum of europium thenoyltrifluoroacetonate dihydrate chelate.
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4. Fig. 3 Typical mass spectrum of the acid digested ink sample.
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5. Fig. 4
Typical mass spectrum of the acid digested ink sample tagged with europium thenoyltrifluoroacetonate dihydrate chelate.
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6. Fig. 5 Typical gamma ray spectrum of the neutron activated ink sample.
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7. Fig. 6
Typical gamma ray spectrum of the neutron activated ink sample tagged with europium thenoyltrifluoroacetonate dihydrate chelate.
Forensic Science International  , 32-42DOI: ( /j.forsciint )
Copyright © 2005 Elsevier Ireland Ltd Terms and Conditions