Discussion
The other name for invisible ink is :
Answer: B
Invisible ink is also called sympathetic ink.
Sympathetic ink is writing that is invisible when it dries and appears only when treated, for example by heat, ultraviolet light or a chemical reagent. Lemon juice, milk and solutions of cobalt chloride are traditional examples, and secret writing in espionage and in prisons is examined in this way.
'Illegible', 'hidden' and 'concealed' ink describe the effect in everyday words, but sympathetic ink is the established technical name.
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