Usually found as a bright middle yellow. PY154 is a famous yellow that is an alternative to Aureolin, also known as cobalt yellow, as well as other more modern yellows. PY154 has far better lightfastness than the yellows it is able to replace. While not perfect, the lightfastness of PY154 is between good and excellent.

While this color is often more of a pure "primary" yellow, the sample we’ve worked with is a deep yellow-orange so the color may vary a bit.

In terms of health, Monona Rossol's work notes that the chemical in PY154 may metabolize to create something that causes or is related to causing methemoglobinemia.