Intrinsicness and the Duplication Account

Last Friday, Maya Eddon presented a paper ("Intrinsicality and Hyperintensionality") arguing against the adequacy of the duplication account of intrinsicality (where, intuitively, intrinsic properties are those that objects possess solely in virtue of the way the objects themselves are).

Granting, for purposes of spelling out a duplication account, that there is a privileged set of (perfectly) natural properties, we can define what it is to be a duplicate: an object x is a duplicate of object y if and only if x is like y with respect to the instantiation of all perfectly natural properties.

So, the duplication account of instrinsicality is:
DUP: A property P is intrinsic if and only if it never divides duplicates.