Colour evolution (in the u-i index of the SDSS) of galaxies G1 (top panel) and G2 (bottom panel) as a function of time while interacting with different cluster environments. The slow evolution towards redder colours in the interactions with clusters B and C is actually very similar to the evolution of the galaxies in isolation, showing that the gas consumption timescale is not significantly affected by RPS in these models. This is different in the deep interaction with cluster A, where a rapid shutdown of SF is achieved.