The aquarelle technique is used by watercolor painters, often in landscape painting. The work is often described as difficult to master, due to the fact that each mistake is easily seen through this transparent technique.
Painters often need to work quickly with the aquarelle technique, as the water and paint is quickly absorbed by the paper. If the painter waits too long, another apparent layer is created on the work. The trick to having a successful painting is to know the proper combination of water and paint to use.
Wet parts of the aquarelle paintings do tend to bleed. Dry time depends on humidity of the surrounding area. Another fact to consider is knowing where to leave the painting white or untouched. Just as with any other watercolor painting, knowing where the light hits allows the picture to look more complete.