Maybe It's The Coffee?
a:  Caffeine ~
b:  a temporary hair darkener
What:  "See, caffeine is like a temporary hair darkener. I feel odd because this post is going to be so short because it is so damn easy. But all you have to do is brew a few cups of straight up black coffee, and rinse with it after shampoo and conditioner. Do this everyday for a few weeks and your hair will turn a few shades darker."
Useful?
Writer:  Bluebird
LCC: 
Where:
Date:   Jul 22 2013  5:51 PM
# 3403 Critique Analogy
