A museum show is the acid test for photojournalism.

They might have passed the acid test of being too big.

He was the embodiment of big-city scrappiness, a mean-streets survivor who got ahead on a good grin, good moves and better hustle.

He found the egg-shaped perimeter of Nikita Khrushchev's head sweeping to a comic climax in the dark hole of his open mouth.

Right now is not the acid test. The [banking/research] conflict isn't there. But it will come back.

Every formula of every religion has in this age of reason, to submit to the acid test of reason and universal assent.