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We present Monte Carlo line transfer models that investigate the effects ofdust on the very late time emission line spectra of the core collapsesupernovae SN 1980K and SN 1993J and the young core collapse supernova remnantCassiopeia A. Their blue-shifted emission peaks, resulting from the removal bydust of redshifted photons emitted from the far sides of the remnants, and thepresence of extended red emission wings are used to constrain dust compositionsand radii and to determine the masses of dust in the remnants. We estimate dustmasses of between 0.08 - 0.15 M$_\odot$ for SN 1993J at year 16, 0.12 - 0.30M$_\odot$ for SN 1980K at year 30 and $\sim$1.1 M$_\odot$ for Cas A at year$\sim$330. Our models for the strong oxygen forbidden lines of Cas A requirethe overall modelled profiles to be shifted to the red by between 700 - 1000 kms$^{-1}$, consistent with previous estimates for the shift of the dynamicalcentroid of this remnant.

Dust masses for SN 1980K, SN1993J and Cassiopeia A from red-blue emission line asymmetries