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The Different Kinds of Ink Met With-Inks That Darken by Exposure to Sunlight and Air-Introduction of Aniline Colors to Determine the Age of Writings-An Almost Infallible Rule to Follow-To Determine Approximate Age of Ink Possible-The Ammonia System a Sure One-A Question of Great Interest to Bankers and Bank Employes-Thick Inks and Thin Inks-So-call