The great advantage of reproducing the bust in wax is that it enables the artist to work upon it so that the wax bust is not only equal to the original in plaster or terra-cotta, but may become even superior to it, for the artist on seeing his work in a material of another colour, and after a certain time, may discover certain faults which he can correct in the wax, or if he thinks it necessary he can make such alterations as he may consider advisable.