The demand for such a pigment came from commercial printers who wanted a cyan to replace Prussian Blue. The dark color was observed in a kettle where a dye was being made from a British dyestuff plant. Historyĭeveloped 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. Phthalo Blues have no significant hazards, although those made before 1982 contained some PCBs (polychlorinated biphenyls). 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. Phthalo Blues are completely lightfast and stable and are permanent for all paint uses. Phthalo Blue is a good color for glazing. It is among the most compatible of modern colors with mineral colors and is considered more reliable than Prussian Blue, while sharing the same physical and color properties. When using alone, mix with some white, as Phthalo Blue can be semi-transparent and almost black on its own. When mixed with other colors or if chlorine is added, Phthalo Blue quickly tends towards green. In oil form, blues are very deep and slow drying. They have a very high tinting strength and tend to overwhelm other pigments, but if color strength can be controlled, they make predictable mixed colors. Phthalo Blues are pure and clean primary blues with superior covering power. Pigment Information This color contains the following pigments:
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March 2023
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