Question: are cellophane bags acid free?
Answer: It is recommended by both the International Organization for Standardization ISO 10214:1991(E) Sect 4.3 and the American National Standards Institute ANSI IT9. 2-1991 Sec 3.3. The polypropylene used in our Cello Bags is naturally acid free and lignin free and conform to PAT ISO standard 18916.