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Phthalo Blue VS Ultramarine Blue Pigments

What is the Difference of Phthalo Blue VS Ultramarine Blue

Phthalo blue vs Ultramarine blue pigments, they are two common blue pigments and widely used in industrial fields such as plastics, coatings, printing inks, as well as in painting and other artistic applications. Although both belong to the blue color range, there are significant differences in their chemical composition, color characteristics, and applications. For manufacturers, color designers, and artists, understanding these differences is crucial for selecting the appropriate pigments or colors. Let’s delve deeper into the distinctions of phthalo blue vs ultramarine blue pigments.

Chemical Composition

Phthalo blue is a kind of organic synthetic pigment. There are two common pigments, Phthalo blue PB15 and Phthalo blue PB16. Their main structures are phthalocyanine compounds.

Ultramarine Blue belongs to the category of inorganic pigments. It is a natural mineral pigment typically obtained through the heat treatment of limestone and sulfur ores. Its chemical composition mainly comprises sulfated alumino-silicates.

Phthalo Blue VS Ultramarine Blue

Color and hue

Phthalo blue usually appears as sky blue, with two shades of red-blue and green-blue.

Ultramarine Blue is a relatively deep royal blue color, usually presenting a slightly purple red tone.

Interestingly, although Ultramarine blue is an inorganic pigment (inorganic pigments are generally not as bright as organic pigments), its color looks more vibrant and full than Phthalo blue.

Performance

Phthalo Blue has strong tinting strength and good transparency. It performs slightly inferior to Ultramarine Blue in terms of lightfastness and weather resistance. However, within the category of organic pigments, Phthalo Blue exhibits outstanding overall performance

Ultramarine Blue has high covering power, although its color may seem brighter than Phthalo Blue, its tinting strength is comparatively weaker. As an inorganic pigment, Ultramarine Blue demonstrates relatively good stability against light and weathering, being less prone to fading due to exposure to light and oxidation.

Phthalo Blue VS Ultramarine Blue Pigments Color Chart

Applications

Phthalo blue is widely used in painting, especially in oil painting and watercolor painting. Due to its color stability and transparency, it is also commonly used in printing inks, coatings, and various plastic products.

Ultramarine Blue is also a commonly used pigment in the field of painting, especially in classical painting. Its color is bright, but not as transparent as phthalo blue. Ultramarine Blue has a blue light whitening effect, which can neutralize the yellow light in products. It is widely used in fields such as paper, plastics, paint, ink, cosmetics, and various daily chemical products.

Conclusion

In summary, both Phthalo blue and Ultramarine blue pigments exhibit excellent performance. The main difference of Phthalo blue vs Ultramarine blue lies in Phthalo blue being an organic pigment with good transparency and strong tinting strength, while Ultramarine blue is an inorganic pigment with a deeper color, higher opacity, but weaker tinting strength. Additionally, Ultramarine blue is more cost-effective compared to Phthalo blue.

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