Discussion
Which of the following are used as time tags ?
(a) Rare earth metal
(b) Optical whitener
(c) Fluorescent tags
(d) Alcohol
Choose the correct answer from the options given below :
Answer: A
The time tags are (a), (b) and (c) only.
Some ink manufacturers add tags to their inks so that the ink, and from it the earliest possible date of a document, can be identified: rare earth compounds, optical whiteners and fluorescent compounds, changed from year to year. Detecting the tag shows when a batch of ink was made, which can expose a document dated before the ink existed.
Alcohol is a common solvent in inks that evaporates as ink dries, so it cannot serve as a lasting tag, and options containing (d) are wrong.
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