PY 154 – benzimidazolone yellow H3G

It is considered a good primary yellow

Manufacturer/ product code:  Kremer / 23310
Chemical Description:  organic benzimidazolone
Color: yellow
Color Index: PY 154
Date:  from 1960

PY 154 – Benzimidazolone Yellow H3G is a synthetic organic pigment belonging to the benzimidazolone family, a group of high-performance yellow pigments prized for their bright, warm coloration, excellent lightfastness, and chemical stability. PY 154 is characterized by a slightly warmer, golden-yellow hue with high chromatic purity, making it versatile for both artistic and industrial applications.

Chemically, PY 154 is based on the fused aromatic benzimidazolone structure, in which nitrogen atoms stabilize the chromophore, providing outstanding resistance to light, heat, and chemical agents. This robust molecular framework ensures long-term color permanence in paints, coatings, plastics, inks, and fine art materials. Its chemical inertness allows it to retain chromatic integrity without interacting adversely with other pigments or binders.

In practical use, Benzimidazolone Yellow H3G exhibits high tinting strength and semi-opaque to opaque behavior depending on particle size and formulation. It blends cleanly with other yellows, oranges, and reds to produce a broad spectrum of warm hues, and its transparency enables glazing and layering techniques in oil, acrylic, and watercolor media. The pigment’s slightly warmer tone makes it particularly useful for creating luminous, sunlit effects and vibrant warm tints.

From a conservation standpoint, PY 154 is highly stable and resistant to fading, maintaining both chromatic purity and brightness over extended periods. Its predictable chemical behavior ensures durability in complex pigment mixtures.