We have been asked a few times for Acid Free papers. The following are responses from the supplier’s websites.
Hahnemuehle’s papers are all acid free it is on their website under FAQs https://www.hahnemuehle.com/en/artist-papers/frequently-asked-questions.html
They also provide a document on the inside of the box of paper. It isn’t noted on the outside of the box.
The Canson Infinity Range of papers are also Acid Free:
https://www.canson-infinity.com/en/what-does-museum-quality-mean
It isn’t stated anywhere on the paper packaging at all or document inside.
Epson’s Signature Range of papers are also Acid free, https://www.epson.com.au/shoponline/shop/DisplayConsumable.asp?ID=2414
It is also listed on their Box.
Ilford Papers – State the following on their FAQ
https://ilford.com/support/galerie-desktop-sheets-faqs/#toggle-id-14