  A transient color flux across null infinity in classical Yang-Mills theory is
considered. It is shown that a pair of test `quarks' initially in a color
singlet generically acquire net color as a result of the flux. A nonlinear
formula is derived for the relative color rotation of the quarks. For weak
color flux the formula linearizes to the Fourier transform of the soft gluon
theorem. This color memory effect is the Yang-Mills analog of the gravitational
memory effect.

High Energy Physics - Theory;High Energy Physics - Phenomenology