And you get lovely petals that look like this.
Also as stated before the best way to load your brush is to go back and forth, with the bristles and avoid 'swirling' the brush in the paint. You will get a better load this way and it will be less stress on your brush (which will make it last longer).
The only down side to this technique is the issue of reloading. See after yo put that brush in the dark color, it's near impossible to load the light color again with out contaminating it with the dark color.
This problem of reloading has gotten some artists rather creative and thus petal pots were created.
"How cleaver!" I thought, as it pretty much solves the issue with double loading. In fact I was almost going to make my own but then it hit me.... To load the paint... I would have to swirl my brush.
The more I thought about it, the more I didn't like it. I thought about how this would cause more stress on the bristles of the brush, and ultimately make them start to fray a lot faster. I might as well stick my brush into an extremely dull pencil sharpener.
"Feed me your art supplies!"
Then there are all the little reasons. This taking time and paint to create, it being yet another thing to carry in my kit and take up table space etc. And for what? To save a little reload time? The price seemed too high, so I ultimately came to the conclusion that this was not something I wanted to make.
If you really need to reload your brush you can wipe off the dark tip, but I find the best thing to do is just make sure you have a good load to begin with. If you have a good load that will last through all the petals you want to make then there is no reason to reload! The secret to doing this is all about having thew right brush. My older round brushes were long and thin and couldn't really hold enough paint most of the time, but with a shorter and fatter brush, the problem was solved.
I recommend the Silly Farms Petal Brushes, as they are thick and short, thus holding a lot of paint and help to make this easy technique even easier (stupid easy really).