Identifying the type of mint. Just to confuse the picture even more, there is a chocolate mint which has purplish stolons. There are, in fact, hundreds of varieties of mint, some of which are commercially grown for oil extraction or for leaf drying, and a lot of which haven't even been given names, being known as Mint 341, etc.
Simply put, watercolor is a painting compound using water-soluble pigments that are either transparent or opaque. Because of the medium itself as well as the paper to which it is applied, watercolor is frequently thought of as a fugitive medium.
Liquid Watercolors contain dyes as well as pigments, suspended in an aqueous medium. They are especially brilliant and transparent. Because they are moist and fluid, they are suited to thin washes and airbrush application as well as conventional brushwork. Many of the more brilliant colors are fugitive, so liquid watercolors are used most often for illustrations that will be scanned for reproduction.