A multilayer imageable article with at least two layers including a multiphoton
imageable composition. The composition includes a multiphoton-sensitive photoactive
system and at least one of a dye and a dye precursor. The photoactive system includes
a multiphoton sensitizer capable of simultaneously absorbing at least two photons,
an electron acceptor capable of transformation to a dye-activating species upon
interaction with the multiphoton sensitizer subsequent to absorption of at least
two photons, and optionally an electron donor.