Acid Test Pen, Folder test question

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      Amanda Reed

      I made an alarming discovery with my acid test pen the other day, that I would love to get some clarification on if anyone has wisdom to share.


      I have been using Smead Organomics Recycled folders, which were advertised as “acid free”. Indeed a test with the acid test pen gave a “green” response color indicating a neutral PH.  However I have just discovered that over time (15 minutes to an hour) this mark is fading to an acidic “yellow” response. In all other papers I’ve tested with this same pen, the color/ph indicated is clear within a few seconds and does not change over time.

      So my question is.. are these folders neutral ph or acidic? And what does a gradually changing PH indicator mean??


      many thanks,

      Kelly Revak

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