An apparatus for comparison of foaming properties of soaps and detergents

Summary 1. The measurement of the foaming properties of soaps and detergents is shown to be possible by comparing the relative stability of a foam by measuring the effect of an arbitrary standard destructive mechanism acting upon a volume of foam during production under standard conditions and protected from adventitious destructive forces. 2. A simple apparatus and procedure for carrying out foam tests has been described and the reproductibility of the test evaluated. 3. Previous studies of foam comparison have been reviewed and criticisms offered regarding the procedures and conceptions involved.