Changes in composition of ballpoint pen inks on aging in darkness.

@article{Andrasko2002ChangesIC,
  title={Changes in composition of ballpoint pen inks on aging in darkness.},
  author={Jan Andrasko},
  journal={Journal of forensic sciences},
  year={2002},
  volume={47 2},
  pages={324-7}
}
A method for comparison of the relative age of ink entries written by the same ballpoint pen on documents stored in darkness is presented. Inks were extracted from the document and analyzed by HPLC (high performance liquid chromatography). On aging, changes in the chemical composition of the inks were noted. These changes were similar to those observed when inks were exposed to light or heat. The aging was followed by using ternary diagrams constructed for dyes generally present in blue-colored… CONTINUE READING
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