Recognized and dreaded by seasoned Risleyites, this notorious foam builds up along the sides of the gorges to dry out and quiver in the breeze on warmer days. It turns a deep brown as it dries.
It lends its name to the Ris-word "foamy," meaning "sketchy beyond all reason." (See the Ris-Lexicon entry).
It is NOT, under any circumstances, to be spread in bikini-patterns on naked bodies. I repeat: Do not fall for its "looking so pure in the moonlight" routine!! For the love of God!