I've only heard of doing the strand test going up the strand.
I still feel every bend if I go down the strand, but it's an easier ride down. It doesn't "squeak" going down. My hair has product on it now so I can try this when I wash it next time.
I definitely understand the structure of hair, yet all I've ever read of the strand test indicates to go up the hair. The YouTube video above for example, shows going upward. So do links like
HERE and
HERE and everywhere I've ever read. But I will try it downward on clean hair too then, and note any differences.
@
Amarilles I didn't read those links because they are wrong and I am always afraid that ignorance might be catching so I don't expose myself to it if I know better. It scares me how one person gets something wrong when they teach and then everyone echoes it like it's gospel and preaches it to unsuspecting folks thus spreading the ignorance. (Kinda like that lie that cold water closes pores that just about every aesthetician will recite when it's as wrong as the day is long!) Read any scientific articles on hair science, not articles written by people who learned haircare from a hair forum, and you will find that one of the tests kids do in science class to feel hair cuticle is stroke it from tips to scalp. First they do the scalp to tips test and muse at how smooth the hair feels. Then they stroke it tip to scalp to feel the cuticle. They don't just tell high porosity kids to do this but everyone does the same test and results are always the same for EVERYONE regardless of porosity.
I do not believe feeling hair from scalp to tip (or even the wrong way you are all doing it) can tell you anything about porosity because the cuticle will always feel smooth in one direction and rough in the other. Now if your hair has damage or if you're forgetting that our hair is like a ribbon and so it twists and when stretched will look like this =-=-=- because the narrow parts are the twist in the hair, then you will think you're feeling the cuticle. But you are not because the scale are miniscule. It's kinda like how materials are made of atoms and aren't one solid block. But we don't feel the molecules coz they are small. We just feel a solid smooth material. Same thing here. Cuticles may not be as small as atoms but you get the idea.
(BTW, a little OT but I understand some hair guru actually wrote in a book that our hair is shaped fat thin fat thin like this --==--==--== and used the idea of looking at a hair strand in light to see this
Clearly this person does not get the point that afro hair strands are flattened and because our hair is coiled, if you pull that coiled ribbon straight, you actually end up with a twisted ribbon hence the fat thin fat thin appearance. Just wow @ the nonsense passed on as information!)
Anyway back to hair science and the cuticle:
http://www.exploratorium.edu/exploring/hair/hair_2.html
Even if it were possible for someone to feel microscopic scales when going along the grain scalp to tip, how can one differentiate raised and normal. If one's sensitivity is so good as to feel microscopic bumps when one can't even feel pores on one's skin which can be seen
, then, heck, they shoud feel the
low porosity bumps too coz it's not like the scales melt into the hair; they are just lying closed.
And then comes my next question: unless you of this super sensitivity have high, normal and low porosity samples next to you to compare, how would you be able to tell the difference between raised high and raised just a bit and not raised? The difference would be so insignificant, I'm talking nanometers. I mean we are talking about scales so many times smaller than the thickness of hair!
IMO people who make claims like you can feel porosity have no idea about scale. It reminds me of when people would swear they grew 2 inches of hair in a short time and then post an image showing 2 centimeters. Or when people say they trimmed 1/8 of an inch.
That is about this long -->
_ Really?? You want us to believe that you were able to snip off that tiny amount from all your strands and nothing more? Can you even see that with scissors in the way? Yeah whatever!
No wonder everyone is confused about porosity coz you have wrong information being passed around.