Full Idea
If there are a varied group of red objects, the only element that recurs is the colour. But it must be the colour as a particular (a 'trope') that is involved in the recurrence, for only particulars can be many in the way required for recurrence.
Gist of Idea
Red could only recur in a variety of objects if it was many, which makes them particulars
Source
Keith Campbell (The Metaphysic of Abstract Particulars [1981], §1)
Book Reference
'Properties', ed/tr. Mellor,D.H. /Oliver,A [OUP 1997], p.127
A Reaction
This claim seems to depend on the presupposition that rednesses are countable things, but it is tricky trying to count the number of blue tropes in the sky.