An extension of the Alien and Goldfinger model of the prediction of the color of absorbing-scattering fibers to the case of a colorant mixture has been proposed. Using this approach, the spectral reflectance of an array of dyed polyester fibers with a colorant mixture are calculated from spectral absorbance measurements of the colorant. The results are compared to those calculated by applying Kubelka-Munk analysis on the predicted reflectances of each of the colorant mixture’s components. The predicted spectral reflectances coincide well with those measured experimentally.