Bernard, I would like to recommend a book:
The Handbook of Organic Compounds by Jerry Workman, Jr.
In this book it is clearly stated that (Page 140):
Acetic Acid can be detected at 895 and 995 nm
Lactic Acid can be detected at 925 and 1035 nm
I also built model that measure Ethanol in spirits, range 0-96% with results: R2 = 0.988 | RMSE = 3.409. However I would like to repeat experiment with accessory for liquids.
