Take a look at this interesting milk packaging. It changes color as it gets closer to the expiration date.
I think this could be a novel way to tell people when their cosmetics have expired.
Perry has been formulating cosmetic products and inventing solutions to solve consumer problems since the early 1990’s. Additionally, he has written and edited numerous articles and books, taught continuing education classes for industry scientists, and developed successful websites. His latest book is Beginning Cosmetic Chemistry 3rd Edition published by Allured.