  We study the criticality of a Potts interface by introducing a {\it froth}
model which, unlike its SOS Ising counterpart, incorporates bubbles of
different phases. The interface is fractal at the phase transition of a pure
system. However, a position space approximation suggests that the probability
of loop formation vanishes marginally at a transition dominated by {\it strong
random bond disorder}. This implies a linear critical interface, and provides a
mechanism for the conjectured equivalence of critical random Potts and Ising
models.
