Acadine

In Greek mythology, Acadine was a magical fountain described by the Greek historian Diodorus Siculus. When writings were thrown into the fountain, they floated to the top if genuine, but otherwise sank to the bottom where they were devoured by Hades. ...
Found on http://en.wikipedia.org/wiki/Acadine

Acadine

The acadine was a fountain in Sicily which, according to legend, would reveal if writings were truthful. Written documents to be tested were thrown into the fountain, those which were false or spurious would sink to the bottom, faithful and sincere documents would float. The fountain was used to test oaths and promises.
Found on http://www.probertencyclopaedia.com/browse/DCA.HTM
No exact match found