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September 26, 2013 at 11:50 am
#132399
Member
As I recall, the instructions we received with an acid testing pen said that there could be a delayed reading for certain papers- coated, or slick, or heavy I think. So I’d think your pen was just slow to get to the correct color. You could do some test marks on papers around the office to see what you think about response time, but you probably may need better folders.