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We present colours of sources detected with the Herschel/SPIRE instrument indeep extragalactic surveys of the Lockman Hole, Spitzer-FLS, and GOODS-N fieldsin three photometric bands at 250, 350 and 500 micrometers. We compare thesewith expectations from the literature and discuss associated uncertainties andbiases in the SPIRE data. We identify a 500 micrometer flux limited selectionof sources from the HerMES point source catalogue that appears free fromneighbouring/blended sources in all three SPIRE bands. We compare the colourswith redshift tracks of various contemporary models. Based on these spectraltemplates we show that regions corresponding to specific population types andredshifts can be identified better in colour-flux space. The redshift tracks aswell as the colour-flux plots imply a majority of detected objects withredshifts at 1<z<3.5, somewhat depending on the group of model SEDs used. Wealso find that a population of S_250/S_350<0.8 at fluxes above 50 mJy asobserved by SPIRE is not well represented by contemporary models and couldconsist of a mix of cold and lensed galaxies.

HerMES: The Submillimeter Spectral Energy Distributions of Herschel/SPIRE-Detected Galaxies