Well if you read some of the posts there are numerous references to people wishing to prove this to themselves and others...so I don't think you are in a position to speak for everyone! Some of the posts have even made requests from others for what type of dye to use. My reccomendations are only that a water based dye,such as beet juice or food coloring , aren't going to "prove" anything so why waste the time. Find a dye that will color whatever oil you choose to use and then you might, for those of you who wish too, be able to discern where the "stones" are coming from. Passing stones colored green does not mean anything since bile is green and is dumped into the intestine in large amounts.....it does not necessarily mean that the stones were formed in the gall bladder or liver...the small intestine is still a likely candidate based on that criteria.