Full Idea
Essentialists mostly accept the distinction between primary and secondary qualities, ..where the primary qualities of things are those that are intrinsic to the objects that have them.
Gist of Idea
Essentialists mostly accept the primary/secondary qualities distinction
Source
Brian Ellis (The Philosophy of Nature: new essentialism [2002], Ch.3)
Book Reference
Ellis,Brian: 'The Philosophy of Nature: new essentialism' [Acumen 2002], p.41
A Reaction
One reason I favour essentialism is because I have always thought that the primary/secondary distinction was a key to understanding the world. 'Primary' gets at the ontology, 'secondary' shows us the epistemology.