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Figure 4: Depth of penetration of hair dyes a. Larger molecules of temporary hair dyes are unable to penetrate into the cortex b. Smaller molecules of semi-permanent hair dyes easily penetrate into the cortex, but diffuse out easily in the subsequent washes c. Smaller dye precursors penetrate into the cortex and undergo oxidation to form large colored molecules that remain within the cortex and are unable to diffuse out

Figure 4: Depth of penetration of hair dyes a. Larger molecules of temporary hair dyes are unable to penetrate into the cortex b. Smaller molecules of semi-permanent hair dyes easily penetrate into the cortex, but diffuse out easily in the subsequent washes c. Smaller dye precursors penetrate into the cortex and undergo oxidation to form large colored molecules that remain within the cortex and are unable to diffuse out