sourness

The proper sourness is indicated by the formation of a stiff brat upon the surface which has become uneven.

The amount of lemon juice depends, of course, on the sourness of the apples.

A ruffle of sourness shot over the features of the earl, and was noticed by both eager betters, who exchanged a glance.

It is a rule never to use pearlash for Indian, unless to correct the sourness of milk; it injures the flavor of the meal.

He had no sympathy with a flippant cheerfulness: upon the surface was sourness, discontent, displeasure, ill-will.