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Optical images of droplets of methylene blue stained water and methyl red stained oil spreading on the surface of the chitosan–glutaraldehyde cryogel (glu, 0.2 vol %) sample (A) and the tablet compressed by pure chitosan powders (B). Diffusion of methylene blue stained water through the chitosan–glutaraldehyde cryogel (glu, 0.2 vol %) sample (C).
