Science of Shampoo
There are as many shampoos as there are types of hair…
Whatever it looks like, a shampoo should wash, enhance, care for and treat both the hair and the scalp. A head of hair is made up of approximately 120,000 hairs.
A length of 25 cm represents about 8 m2 of surface area. It is a shampoo’s job to clean this surface area in just a few minutes.
The outside of a hair, called the cuticle, is composed of overlapping scales, like the shingles on a roof. Dirt clings to these waterproof shingles.
Washing a hair means wetting the hair fiber and coating and emulsifying the dirt to eliminate it. Only surface agents are capable of this feat.
Therefore, a shampoo’s ability to wash has nothing to do with how it lathers lather.
To formulate a classic shampoo: while stirring, pour together surface agents, preservatives, silicone, and pearl-based fatty substances that will cover the hair fiber to encourage detangling and increase the hair’s shine; then add thickener, aromas and a pinch of salt.
As many additives that will improve the smoothness, soothingness and stability of the lather. The rest is water.
Once the shampoo’s is complete, L’Oréal researchers analyze it to check is physicochemical properties.
They next study the shampoo’s performance on hair: shine, resistance, ability to detangle.
The ultimate verdict will come from use.
The word “shampoo”, meaning massage and penetrate, comes from Hindi. So don’t forget to massage it in, and let the science fade away.