Found it, but... "For this project, I selected IGI 1343 to make the chunks as well as the overpour. If no additives are used, this wax is somewhat translucent and results in brilliant colors that have some depth to them. If you are using this wax and you intend to add fragrance oil, then the addition of vybar 103 or Universal Additive will be required. These additives will increase the opacity of the wax." Exactly why it didn't provide the information I'm looking for. To be more specific, Why do some recommend harder waxes for the chunks? What is a good pre-blended wax with good translucency?