KeraUnderstand
Understanding your hair
Before a routine can be right, the hair has to be read correctly. These are the measurements that matter and the tests that actually work at a bathroom sink.
How to test your hair's porosity (and why the float test is useless)
The float test measures whether your hair has product on it. Three better checks, and what porosity actually changes in a routine.
Density, diameter, volume: the three things people call "thick hair"
How many hairs, how wide each hair, how much space they fill — three separate measurements that people collapse into one word.
What curl-type charts (2A to 4C) get right, and where they stop working
Where the 2A–4C system came from, the one thing it does well, and the four properties that predict your hair's behaviour better than a letter does.
Your scalp is skin, and it is telling you things
Flaking, itch, tightness, oil — what the four scalp signals usually mean, and the point at which a routine stops being the answer.
The hair growth cycle, and why it explains most hair worries
Why you shed about a hundred hairs a day, why your hair stops at a certain length, and why nothing you do shows up for three months.
Shedding or breakage? Tell them apart in thirty seconds
A white bulb means shedding. A tapered end means breakage. The check takes thirty seconds and it decides your entire plan.