Colour issue with sight

One of the issues that has often interested me is do we all share a common experience of colour. Is what i see as red what another person would call red. The main reason that this has often concerned me is that there is no possible way to know whether or not we experience colours the same way. For all we know colour is unique to each one of us. This is a nice thought however either way it makes no difference what so ever. As long as one can distinguish between 'their' different colours there is no issue with whether or not that colou is different in another persons eyes.