Core-collapse Supernovae (CCSNe) have long been proposed as major dust providers to galaxies. However, observations have not yet confirmed this hypothesis. We study the ejecta composition of a 20 solar masses supernova based on a chemical kinetic approach including the formation of molecules and dust precursors from the gas phase. Mixing of hydrogen and heavy elements is a key parameter to discriminate between carbon or silicate/metal oxide dust. The derived molecular content and dust amounts are compared to new observations with Spitzer. Our previous study on primordial supernovae highlights the importance of certain chemical routes to the formation of carbon dust in a high temperature, H-poor, He-rich medium. We use these results to study the formation of carbon dust in the RCrB star V854 Cen, to help identifying the nature of the Diffuse Interstellar Bands (DIBs) carriers.