Narda transforms into Darna, and vice versa, by shouting out their respective names (Darna to become Darna, Narda to become Narda). First, however, Narda has to swallow the white stone, which conveniently comes out of her mouth every time Darna changes back into herself. However, it was not so in her comic incarnations, it started in the 1973 film "Lipad, Darna, Lipad!" ("Fly, Darna, Fly"). Without the stone in her mouth she can say the name of whichever form she is not using without automatically changing.