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(A) Fluorescence micrograph and (B) intensity profile of a dual-layer hydrogel formed by sequential visible light-mediated thiol-ene photopolymerization. Red and blue fluorescence were from the eosin-Y added in the core gel and blue microparticles added in the coating macromer solution, respectively. (10 wt% PEG4NB-DTT pre-formed gel with 2.0 mM eosin-Y, 10 wt% PEG4NB-DTT and 2 minutes of secondary polymerization, 5 % blue particles, Scale bar: 200 μm)
