I don't know the scientific reason but to me it's kind of like your windows getting dirty. Windows/grey hair have little or no color. Smoke, pollution, minerals in the water, dust from the furnace, hair products, etc all add a layer to the surface of your windows/hair.
I spend alot of time in the sun in the summer and it also makes my hair get a yellow tint to it.
And heat from curling irons/flat irons/blow dryers can make grey hair very yellow. I honestly don't know how people deal with that who use heat stylers on their hair every day. My sister ran her new flat iron through a strip of my hair one day just to see if it would straighten my tough hair and it instantly turned it a very dark yellow color. Ick.
--I'm located in Western PA.
--I found NC in late 2004, CG since 2-2005, started going grey in late 2005.
--My hair is 3B with some 3A, texture-medium/fine, porosity-normal except for the ends which are porous, elasticity-normal.
--My long time favorite products are Suave & VO5 conditioners, LA Looks Sport Gel, oils, honey, vinegar.
--My CG and grey hair progress -- http://www.naturallycurly.com/curlta...-progress.html

Last edited by jeepcurlygurl; 01-30-2014 at 03:10 PM.