The optical properties of Boron Nitride are approximately the same as the more common ingredients used for achieving a soft focus effect. Because BN is a useful raw material for a variety of applications, there is a wide range of powders available commercially. Although there is much more complexity to the optical properties than could be discussed here, there are a couple of useful general patterns which have emerged. To increase the direct transmission, the particle size or particle "smoothness" must be increased. To increase scattered reflection, the particle should be rough and/or small. Finally, to achieve the lowest specular reflection, the particle size should be decreased.