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Updated: May 25, 2025
The older ink will resist the action of the ammonia longer and give up less soluble matter than the newer writing. Nutgall, and logwood inks, of course, should not be tested comparatively by this method, as the logwood ink will respond to the ammonia sooner than the nutgall ink. F. Carré also gives another method for determining, approximately, the age of ink-writings.
If ink-writings are but a few days old, it is easy to distinguish them from other writing years old. But to tell by the ink which of two writings is the older, when one is but two months and the other two years, is, as a rule, impossible.
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