Comparison of non-microlensed color curves (dotted black) to microlensed ones (with median in solid red, and 1σ and 2σ range in different shades), for 10 000 random SNe positions in magnification map. The vertical black line indicates the first time the 2σ spread of the microlensed color curves exceeds 0.1 magnitudes. The panels are all rest-frame LSST color curves for a saddle image (κ = 0.6, γ = 0.6, and s = 0.6, see Fig. 1), which show an achromatic phase similar to the one reported by Goldstein et al. (2018), but we find the achromatic phase only for combinations of the bands u, g, r, and i (except u − i) and for the color curve z − y up to approximately 25 − 30 days after explosion.