If your hair is brown, purple probably isn't going to show up very well. It's best to bleach your hair before dying it an unnatural color. Like I told you before, the box says 30-40 minutes, but the most I'd leave it on for is an hour. And that's at your own judgment, too.
But China's population statistics can be particularly misleading. Virtually overnight, Chongqing has become the largest city not only in China, but in the world, Time Magazine proclaimed in 2005. But it wasn't true-Chongqing is not the largest city in the world, or even in China.
What is the largest city in the world? Tokyo, with 37.8 million residents, continues to be the largest city in the world in terms of population. It has remained the largest city for over half a century when it displaced New York in 1955. In recent years Jakarta is experiencing a faster population growth than it and may eventually take the number one spot.