Art is a popular medium using paints made of pigments in a
water-soluble mixture. Most watercolor is applied to
watercolor paper, usually cotton. Other support include
barks of trees, plastic (yupo), leather, wood or fabric.
Many new applications are being used everyday. The most
popular watercolor pigment is transparent and is luminous when
layered. There are also opaque pigments that block the
transparency and is not acceptable in some watercolor circles."