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Optical images of human blood before (left) and after (middle) drying and the contact angle sessile drop image (right), respectively, on the (a–c) glass slide surface; (d–f) cellulose acetate surface; (g–i) regenerated cellulose surface. The before and after drying images were taken in transmittance mode. Reproduced with permission from Prathapan et al. (2018).
