Food packaging from recycled papers: chemical, physical, optical properties and heavy metal migration.

Heliyon · 2022 · PMC9576889 · PMID 36267374

Europe PMC DOI

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an increasing trendno p-value reported

R1, R2, and R3 papers showed an increasing trend of opacity values with aging.

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a decreasing trendno p-value reported

The brightness and whiteness of the three types of recycled papers showed a decreasing trend over aging while opacity values showed an increasing trend. pH values of all the papers changed from alkaline to neutral confirming the chemical stability of the papers over aging of 9.8years.

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