Chapter 13

HOW TO DETERMINE AGE OF ANY WRITING

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--Determining Age of Writing By Ink Used--The Ammonia System a Sure One--A Question of Great Interest to Bankers and Bank Employes--Thick and Thin Inks--So-Called Safety Inks That Are Not Safe--How to Restore Faded Inks--An Infallible Rule--Restoring Faded Writing--Restored By the Silk and Cotton System That Anyone Can Arrange--Danger of Exposing Restored Writing to the Sun