Old-fashioned name for sulphuric acid (7)

I believe the answer is:

vitriol

(Other definitions for vitriol that I've seen before include "Sulphuric acid; malicious criticism" , "Acid -- caustic writings" , "Sulphuric acid or savage comment" , "hostile criticism" , "Caustic words" .)

I've seen this clue in The Times.

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