6 adjectives to describe touchstone

We shall probably not arrive at any definition which can be applied as an infallible touchstone to distinguish the dramatic from the undramatic.

J.M. Barrie long ago made a criticism on Rudyard Kipling which has always stayed by me as one of the most useful of critical touchstones.

yet let these passages appear, with a casting weight of allowance, and their absurdity will not be so extravagant, as when examined by the literal touchstone.

but I see you are taking the same view as the police, who persist in regarding a finger-print as a kind of magical touchstone, a final proof, beyond which inquiry need not go.

A mighty touchstone has been applied to these earthly orbs since then, and the power to discriminate has been given to my soul.

I call him my testthe touchstone by which I try a friend.

6 adjectives to describe  touchstone