  We calculate the correction-to-scaling exponent $\omega_T$ that characterizes
the approach to the scaling limit in multicomponent polymer solutions. A direct
Monte Carlo determination of $\omega_T$ in a system of interacting
self-avoiding walks gives $\omega_T = 0.415(20)$. A field-theory analysis based
on five- and six-loop perturbative series leads to $\omega_T = 0.41(4)$. We
also verify the renormalization-group predictions for the scaling behavior
close to the ideal-mixing point.
