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Mesitylene gels at 0.3% w/v. (a) Pieces of doped and undoped gel in alternating order; (b) Compressing the pieces to promote self-healing; (c) Rod of gel after self-healing; (d) Handheld gel rod; (e) Image showing the diffusion of the azo dye into the undoped segments of the gel rod. Reprinted with permission from [61]. Copyright 2017 John Wiley & Sons, Inc.
