"Acids, Bases, and the Chemistry of Taste" I'm using a red cabbage water indicator to test some substances and, so far, I've done Isopropyl alcohol and Saline solution. Neither substance caused any change in the color of the indicator though which I can't figure out... I'm to do a taste test as well but I'm not to taste the alcohol. Wouldn't that imply that it's dangerous? That, to me, says acid but nothing... Is there anything wrong? As for the taste test, I did as I was told and tested all four areas of my tongue but I can taste the saline solution on each one. Is that normal/right?