Put the acid on someone
Put the acid on someone :
A situation or event which finally proves whether something is good or bad, true or false, etc.
The original use of the phrase was to describe a method of testing for gold with nitric acid (gold being resistant to the effects of nitric acid).
1990 Which?: These deals are designed to encourage impulse buying, so the acid test is whether you would have bought anyway.
Come the acid
Be unpleasant or offensive.
Speak in a caustic or sarcastic manner.
Put the acid on someone
Try to extract a loan or favour from someone. (Australian & New Zealand informal)
Put the acid on someone :
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