Full Idea
Maybe strict identity only applies to the particulars (the molecules) in a case of vague identity. …It seems, however, utopian to suppose that we will ever reach a level of ultimate, basic particulars for which identity relations are never vague.
Gist of Idea
We might fix identities for small particulars, but it is utopian to hope for such things
Source
Saul A. Kripke (Naming and Necessity notes and addenda [1972], note 18)
Book Reference
Kripke,Saul: 'Naming and Necessity' [Blackwell 1980], p.51
A Reaction
I agree with this. Ladyman and Ross laugh at the unscientific picture found in dreams of 'simples'.