They can be depending on what you are after. The list can be endless. The main ones to stay away from are vybar, micro wax, luster crystals most of the additives design to get paraffin to do differant things. Best thing you need to do is read. You can read all the past post here then go down to the archives and read some more. There is weath of knowledge here to the person willing to do just a bit of reading.