Good to here that you have heard back.
I have a pen for scrapbooking that you test on an inconspicuous area that lets you know if something is acid free or not. It is a pH pen and can be bought at scrapbook stores but i have also seen them at amazo
Ask Kayly at RNK. This is their distributor and she will know precisely.
Thank you. I already sent a message but I don't know how long it will take for her to get back to me.