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. 2018 Nov 9;10(4):222. doi: 10.3390/pharmaceutics10040222

Figure 3.

Figure 3

Release experiment in an unjacketed Franz cell at T=25C with a colored marker (KMnO4 0.1 M in distilled water). Rotational speed: 500 rpm. The reason why the color is much fader in this experiment as compared to that with 100 rpm—the concentration of KMnO4 being the same—is only a matter of colors in the photo (different camera and different light exposition).