We now turn to prove the core-shell structured water droplet, as resolved from the size dependent phonon frequency shift of Si, CeO2, and SnO2 nanocrystals . One can obtain the PDPS peaks by subtracting the specific H-O phonon peak collected from small emission angles from those of large emission angles upon all peaks area normalized . Fig. shows the PDPS refinement of H-O phonon transition in abundance, stiffness, and structure order from ice mode of 3150 cm -1 and 3200 cm -1 for water to their skins. The skins of water ice share the 3450 cm -1 vibration frequency, which evidences that a supersolid skin covers both water and ice instead of the historical perception of ice covering water or water wrapping ice. Ice skin is estimated 9/4 folds thick that of liquid water, as the latter is subjected to thermal fluctuation.