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Samples with visual texture added for strain tracking: (a) PDMS cruciform (isotropic, homogeneous) textured with graphite powder. (b) PDMS cruciform (isotropic, heterogeneous) textured with spray paint. The central square region is of one-tenth the surrounding thickness. (c) Collagen TE (anisotropic, heterogeneous) with arm-width ratio of 1:0.5 textured by Verhoeff stain and incubated for seven days. (d) Collagen TE sample similar to (c) but incubated for 11 days.
