Re: 12/1/10 Product Info's Tip of the Week:Revitalizing Colored Pencils
I am sorry for any confusion that statement may have caused. From the research I have done, the Derwent Coloursoft Pencils are wax based, but due to their formula they are softer than Prismacolor. Therefore, they may melt more easily.
As for Luminance, I have talked with Caran d'Ache and they keep their formula pretty close to the chest. From my understanding though, they use a softer wax, much like the oil based waxes used for Faber Castell and Lyra. However, they will not release to me the information as to whether or not it is a true oil based wax with actual oils in it. They only tell me that it does not require the fixative needed to prevent wax bloom and that it is a softer form of wax. If you do decide to heat up the Luminance pencils for some reason, make sure to keep an eye on them as they may also melt more quickly.
- your friends at Blick Art Materials