Q: Is ultramarine blue pigment safe? A: Yes. Ultramarine blue (PB29) is non-toxic, non-carcinogenic, and free from heavy metals. It is approved for use in cosmetics, food-contact plastics, and many other sensitive applications by global regulatory agencies.
Q: Why does ultramarine blue lose color in acidic conditions? A: The aluminosilicate framework of ultramarine blue can be attacked by strong acids, causing the polysulfide chromophores to be released and the blue color to fade. This is why ultramarine blue should not be used in strongly acidic formulations.
Q: What is the maximum service temperature of ultramarine blue? A: Standard grades of ultramarine blue are stable up to approximately 400°C. Special high-temperature grades are available for applications requiring even greater thermal stability.
Q: Can ultramarine blue be used in food-contact applications? A: Some grades of ultramarine blue are approved for food-contact applications under specific regulations. Buyers should consult applicable regulations and request compliance documentation from their supplier.
Q: How do I request samples or a quote from SKU Pigments? A: Visit skupigments.com or contact our sales team directly. We provide samples for evaluation and competitive quotations for regular supply of all our ultramarine pigment grades.