Full Idea
We could rewrite the generalisation as For all x, ((x is a raven and x is black) v (x is not a raven and x is black) v (x is not a raven and x is not black)). Instances of any one of the three disjuncts will do as confirmation.
Gist of Idea
The raven paradox has three disjuncts, confirmed by confirming any one of them
Source
David M. Armstrong (What is a Law of Nature? [1983], 04.3)
Book Reference
Armstrong,D.M.: 'What is a Law of Nature?' [CUP 1985], p.42
A Reaction
A nice clarification.