Simply, watercolor is a compound that uses water-soluble pigments, which are transparent and opaque. Watercolor can not rival oil in durability and longevity. While American artists in the early nineteenth century considered watercolor as an instrument of sketch oil and print, English artists had already raised it to the category of something serious. In England, watercolor was first used by architectural draughtsmen and topographers, but when watercolorists soon began to present figures in their compositions, watercolor became a means of serious expression.
The luminosity of the watercolor combined with its fast execution capacity was an ideal medium to record the brief effects of nature by landscape painters