Full Idea
The trope theorist holds that the blueness of a blue chair really exists as much as the chair, but is not identified with the blueness of anything else, even if it resembles it exactly.
Gist of Idea
Trope theory says blueness is a real feature of objects, but not the same as an identical blue found elsewhere
Source
E.J. Lowe (A Survey of Metaphysics [2002], p.361)
Book Reference
Lowe,E.J.: 'A Survey of Metaphysics' [OUP 2002], p.361
A Reaction
You are left with explaining how 'resemblance' works if you cannot spot some 'thing' in common. It is an inviting idea, though, because it avoids the ontological baggage of universals.