The United States Geological Survey estimates that (as of 2005, the most recent year for which data is available) we withdraw 410 billion gallons of water a day, including both fresh and saline water. Most (80%) of these withdrawals go to thermoelectric power plants (for cooling) and agriculture (for watering crops).
Level 2 is the second darkest hair color level. It is usually used to describe a natural black, and is the natural color of most people who have naturally black hair along with Level 3, soft/light black hair. Refer to the hair color chart. Most drugstore black hair shades are Level 2, medium black. Level 2 hair color is best suited to people whose natural hair color is between Level 2 and Level 3.5.
You see, when dyeing dark brown hair, you use the standard rules of hair dye by using a 10 vol for one level of lift, 20 vol for 2 levels, 30 vol for 3 levels, and 40 for 4 levels. However, when working with black hair, you have to drop everything down one level and increase the vol of developer by one.gain, use a color additive or toner. -- Another way is to use bleach. I find that bleach really isn't needed just to achieve brown hair, but it is an option. Pretty much get your hair to a yellow/orange or yellow color and then tone your hair and then apply the shade of brown you would like.