stopShowingPrismatic(duration) {
    if (this._showingPrismatic) {
      this._showingPrismatic = false;

      if (this._prismaticGlow != null) {
        this._prismaticGlow.fadeToInvisible(duration);
      }
    }
  }
Stops showing the card as prismatic.
@param {Number} [duration=0.0]