Fig. 1. (a) Optical microscopy micrograph of coconut husks (i) unbleached, (ii) after bleaching treatment 1B and (iii) after bleaching treatment 4B; and (b) vials containing
nanowhisker suspensions obtained for different extraction times (1B = dark brown; 4B = yellowish brown). The dark brown color is due to the presence of remaining lignin in
the samples. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this paper.)
Fig.