Discussion
The following method is used for determining the age of an ink by tracking the degradation of certain dyes.
Answer: C
Laser desorption mass spectrometry (LDMS) is the method used to date an ink by tracking the degradation of certain dyes, such as the loss of ethyl groups from rhodamine B (see question 29). It reads the dye and its breakdown products directly from the ink on paper with little damage.
TLC, GC and HPLC are used to separate and compare ink dyes, and HPLC and TLC need extraction, but the key picks LDMS as the one for the age-tracking study. The method looks at how far the dye has degraded, since old ink holds more of the breakdown products than fresh ink.
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