initialize(particle) {
    particle.color = this.a.getValue();
    particle.data.colorA = ColorUtil.hexToRgb(particle.color);

    if (this.b) particle.data.colorB = ColorUtil.hexToRgb(this.b.getValue());
  }
Initialize the behaviour's parameters for all particles

@method initialize
@memberof Proton#Proton.Color
@instance

@param {Proton.Particle} particle