A wide range of material compositions were investigated, as shown in Table , to directly compare if the addition of alginate effected physical, chemical, and/or mechanical properties of the resulting photopolymer hydrogel. As shown in Figure , the addition of alginate to these solutions shows that when exposed to 405nm light, the absorptivity of all the hybrid PEGDA + Alg compositions is statistically significantly higher as compared to PEGDA alone. This increase, though minor in the cases of 5% PEGDA + Alg and 10% PEGDA + Alg, could be attributed to a difference in solubility between alginate and PEGDA, causing microphase separation and resulting light scattering. All six blends have similar absorptive profiles in Figure , with a peak around 370 nm which is related to the inclusion of LAP as a photoinitiator.