Figure 2.

(a) Digital photographs showing the miscibility of three liquids. The deionized water (DI) water contained a water-soluble blue dye, and poly(ethylene glycol) diacrylate 250 (PEGDA 250) contained an oil-soluble red dye when mixed with PEGDA 700. After enough time for mixing, bottles stood for 2 h. PEGDA 250 was immiscible with water, whereas PEGDA 700 was miscible with both PEGDA 250 and water. (b) Ternary phase diagram illustrating the solubility of three solutions in this phase separation system. The blue dots mean that the three solutions were miscible at that volume ratio and the red crosses indicate that the three solutions were immiscible at that volume ratio.