For years I have been using Home Depot denatured alcohol as a fuel reagent. I would mix Lanthanum nitrate, acetic acid and denatured alcohol to end up with a clear colorless solution. Last month when I mixed a colorless solution of La(NO3)3 + acetic acid with alcohol, the solution became pink. It wasn't an instantaneous reaction. It took 10-20 min for it to become pink. Any ideas?
If it is an organic contamination, I am fine. If it is a metal, I have an issue. I called the manufacturer, but they didn't want to admit any changes.