Three colors, blue and white.

“I looked at 100 ads for menstrual products spanning 100 years — shame and secrecy prevailed.” (Via wt.social).

Even as recently as the 1980’s, scientific diagrams showing how to insert tampons were blue. A Sure & Natural ad from 1983 compared the inefficient absorbency of a conventional pad with the quick dispersion of liquid in a “Maxishield” using royal blue liquids. Further graphics demonstrating layers of absorbency in pads used blue arrows and blue ink to demonstrate their effectiveness.