So, I was trying to make the colours of a obj created by this Demo make by the talented people of the Computer Vision Laboratory of University of Nottingham and with no success and frustration I wasn't able to make the colours show up, even less bake to a normal texture map.
Screenshot https://i.stack.imgur.com/RzYWU.png
Link for you to try be yourself http://cvl-demos.cs.nott.ac.uk/vrn/
Thank you and best regards.