Testing the "Float Test" for Hair Porosity, Part One

Porosity is tricky to define because of these three things: 1) Porosity is a physical condition that belongs to an individual hair - or a portion of a hair. It is the amount of surface area with porosities - gaps and holes through which water and other things can move. 2) Porosity is a behavior or your individual hairs and your hair as a whole - how quickly does water move through any porosities present. 3) We want to use porosity to determine what to do to our hair - but all the things we do can modify our hair's porosity-behavior or even mask actual porosity. For example, sun-damaged and therefore porous hair may feel different than bleach-damaged and therefore porous hair. Or hair which is easily weighed down or low-density (thin hair) may or may not be able tolerate lots of conditioner and heavy oil applications that we usually think porous hair needs. Different porous hair has different needs. Why does porosity-behavior matter? Let's say you use a henna or cassia treatment...