The UV–vis transmittance of cellulose-based films is increased by filtration from 20–30% (Film) to 80–90%(f-Film), as shown in Fig. S3. These two kinds of films can meetdifferent demands in industry, and show their potential applica-tions in packaging and wrapping fields where optical transparencyrequirement is not too high, such as packaging tapes, wrappingpapers and so on