As someone who looks on ebay for paper (expense reasons), i now stay away from mgIII... which seems to at this point, begin to fog unless properly stored (as in kept in fridge/freezer for long term use, or kept in cool dark place with minimal changes in room temperature for short term use, which seems to be from right now up to about five years).

I was wondering if even after you get responses, which will probably suggest that you to test the papers themselves, if you could please list the results of your findings. which for general purposes might help others.