  We provide a new estimate of the long-distance component to the radiative
transition $B \to \rho \gamma$. Our mechanism involves the soft-scattering of
on-shell hadronic products of nonleptonic $B$ decay, as in the chain $B \to
\rho\rho \to \rho\gamma$. We employ a phenomenological fit to scattering data
to estimate the effect. The specific intermediate states considered here modify
the $B \to \rho \gamma$ decay rate at roughly the $5 \to 8%$ level, although
the underlying effect has the potential to be larger. Contrary to other
mechanisms of long distance physics which have been discussed in the
literature, this yields a non-negligible modification of the $B^0 \to \rho^0
\gamma$ channel and hence will provide an uncertainty in the extraction of
$V_{td}$. This mechanism also affects the isospin relation between the rates
for $B^- \to \rho^-\gamma$ and $B^0 \to \rho^0 \gamma$ and may generate CP
asymmetries at experimentally observable levels.
