Description
- Phthalo Blues are completely lightfast and stable and are permanent for all paint uses.
- They are currently used in inks, coatings, and many plastics due to their stability and are considered a standard pigment in printing ink and the packaging industry.
- Developed by chemists using the trade name Monastral Blue, the organic blue dyestuff now known as Phthalo Blue was presented as a pigment in November 1935 in London.
- Its discovery was accidental.
- The dark color was observed in a kettle where a dye was being made from a British dyestuff plant.
- The demand for such a pigment came from commercial printers who wanted a cyan to replace Prussian Blue.