Security inks for protecting governmental documents and papers from changing and counterfeiting
and they include
- UV Fluorescent inks
- Optical variable inks (OVI)
- Metameric Optically Variable inks
- Rainbow inks
- Upconverting inks
- Visible Infrared light inks
- Triple thermal inks
- Chemically interactive inks for ratification
- DNA coded inks
- Triple florescent inks
- Magnetic inks
