What I found really helped me in choosing my colour is to goto the leather manuf site. The reason is that a palette like the one above does not always clearly tell you what is the root of the colour and it may have hues of a base colour that you won't see until it is too late. Ever paint a wall and you thought it was green and you find some blue in it.
Well the site showed me the root of the colour and hence I found the root of some colours we were considering had roots/tones that we feared would come out.
Check it out .