Methods and pharmaceutical compositions for treating subjects having pain are provided. A first process is performed upon a material capable of having a photonic crystal structure, this process causing deformation of the material so as to form a film in which incident light received by the material is selectively reflected or transmitted to generate a first optical effect in the film. The model representation is compared with the original representation to arrive at a difference. This method can be applied to carburization heat treatment of a steel workpiece sensitive to heat deformation, such as an annulus gear, in lieu of a conventional gas carburization method using plug quenching. An unknown document fits or not within one of the ranges of values and becomes classified.