Manufacturing Change Window
Definition
The interval between when an ink formulation was introduced and when it was discontinued or reformulated; documents with ink outside this window for their purported date indicate anachronism or alteration.
Related terms
- BKA Ink Reference Collection
- The Bundeskriminalamt (German Federal Criminal Police Office) reference database of European pen ink formulations, used as the evidentiary baseline for questioned-document cases...
- Carbon Black
- A colloidal carbon pigment produced by incomplete combustion; the primary colourant in permanent black gel inks, Indian inks, and archival drawing inks;...
- Ink Tagging Programme
- A voluntary scheme begun in 1979 whereby participating pen manufacturers add annual chemical tags (rare-earth chelates or fluorescent markers) to their formulations;...
- Iron-Gall Ink
- A historical ink formulation of ferrous sulphate, tannic acid (from oak galls), and gum arabic. The ferrous-tannate complex oxidises to brown ferric-tannate...
- Phenolic Resin
- A class of synthetic polymer binder formed by condensation of phenols with formaldehyde; used in ballpoint ink vehicles since the 1950s; identifiable...
- Phenoxyethanol (2-Phenoxyethanol)
- A semi-volatile high-boiling solvent that constitutes a major component of ballpoint ink vehicles; its gradual loss from the dried ink film after...
- Shear-Thinning (Pseudoplastic)
- A rheological property where viscosity decreases under applied shear force; the gel ink delivery mechanism depends on this property: the gel liquefies...
- Triarylmethane Dye
- A class of synthetic dyes (including crystal violet, Victoria blue B) that form the primary colourant in most blue ballpoint inks; characterised...
- USSS International Ink Library
- A collection of ~10,000 dated writing ink formulations maintained by the United States Secret Service since 1968, providing a terminus post quem...
Explained in
- Ink Classification and Chemistry: Ballpoint, Gel, Fountain and MarkerThe interval between when an ink formulation was introduced and when it was discontinued or reformulated; documents with ink outside this window for their purp...