A clear drop in both soil and enzymatic digestibility is observed for those samples with CTA formation. Fortunately, old and new (Eronen-Rasimus et al 2022) studies do show that high DS cellulose acetates can be fully biodegradable. Therefore, the action of redox or esterase species in nature likely has a significant part to play in creating sites where digestive species can penetrate the fibre or fibre network.