It is well known that thermally dehydrated BC cannot be returned to its
never-dried state by rehydrating. The collapse of the cellulose fiber network is not reversible. As
shown in Figure 5b, the elongation at the breaking point of the BCG films from the addition of
5%–10% (w/v) gelatin was also significantly reduced to 0.8%–0.9% (in dried form) and 7.3%–9.8%
(in re-swollen form) or approximately half of the respective values of the BC film.