Not only is this a fantastically variegated medicinal compound, effective as an antidote to carbon monoxide poisoning and cyanide poisoning, as well as an effective treatment against malaria (which Syrian Rue also is), it is an MAOI (so you can eat your Spice) and it temporarily stains the whites of your eyes blue. Seriously. And it is undergoing clinical trials to show whether it slows the development or stops the development of Alzheimer's dimentia. Those of you familiar with Frank Herbert will clearly see the beauty of this connection, and perhaps wonder along with me whether or not this compound helped to inspire the Spice. ...or could be used as a fremen-style ayahuasca component. Of course worms don't make it in the soil....

en.wikipedia.org/wiki/Methylene_blue