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(Hydroxypropyl)cellulose (HPC)/water polarized light microscope, crossed polars, transmission images (a) ~45% HPC, planar and focal conic textures; (b) 55% HPC, focal conic texture; (c) 55% HPC, oily streak texture; (d) ~65% HPC, planar and focal conic textures. The colours of the planar regions between crossed polars correspond to the reflection colours of the samples.
