Since HOAT and IAT blends have some inorganic material they will leave a "trail" at any leak. I can tell you from experience that Dexcool, which has NO inorganic material leaves no trail other than maybe a slight hint of the orange die.

It's also my opinion from experience that Dexcool has more tendecy to seep from hose connections and other potential leak sources. The inorganics in HOAT and IAC precipitate out and form deposits at the leak sources, and these deposits may actually plug the leak path.

Duke