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It has been suggested that multiple scattering on circumstellar dust couldexplain the non-standard reddening observed in the line-of-sight to Type Iasupernovae. In this work we use Monte Carlo simulations to examine how thescattered light would affect the shape of optical lightcurves and spectralfeatures. We find that the effects on the lightcurve widths, apparent timeevolution of color excess and blending of spectral features originating atdifferent photospheric velocities should allow for tests of the circumstellardust hypothesis on a case by case basis. Our simulations also show that forcircumstellar shells with radii r=1e16-1e19 cm, the lightcurve modificationsare well described by the empirical Dm_15 parameter and intrinsic colorvariations of order sigma_{BV}=0.05-0.1 arise naturally. For large shell radiian excess lightcurve tail is expected in B-band, as observed in e.g. SN2006X.

Perturbations of SNe Ia lightcurves, colors and spectral features by circumstellar dust