A solid perfume is a perfume mixed with waxes. The idea is as old as the world. Already in the ancient Egyptian pyramids similar blends of perfume and wax were found. These should not only have an attractive fragrance, but it should be soft enough to easily apply to the skin and on the other hand the melting-point has to be sufficiently high that it will not run from the box on the first sunny day. Advise melting-point over 50 C.