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Old paper and cardboard from before the late 50's is most likely acid free. What is the source of the discoloration is hard to say, but it does not necessarily have anything to do with acid or degrading chemistry
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Did you read the article I posted regarding the lignin factor?
Old paper and cardboard from before the late 50's is most likely acid free. What is the source of the discoloration is hard to say, but it does not necessarily have anything to do with acid or degrading chemistry
>>
Did you read the article I posted regarding the lignin factor?