Wisteria was a breakthrough color for the boro palette: a dense opaque purple that is only translucent when thin. Like all of the opaque Candy colors, Wisteria prefers a soft, enveloping flame. Its not boily, but it can have some air in the rods. If you put it into an forceful flame when cold, the air rushing to the surface can mimic boil. This is why we suggest working slowly and in a bushy soft neutral flame, to allow the occasional larger air bubbles to escape as you work.