C.I. pigment yellow 73

C.I. Pigment Yellow 73 (CAS 13515-40-7, EC 236-852-7) is a monoazo organic pigment also known under the trade names Fast Yellow 4GX and Arylide Yellow Gx, with the colour index designation C.I. 11738. It belongs to the arylide yellow family and is supplied in powder form.

In printing inks and packaging applications, PY73 delivers strong yellow hues through its azo chromophore structure, which absorbs light selectively in the violet-blue region. It is also used in architectural and industrial coatings where its lightfastness and resistance to bleed support durable colour retention, and in plastics compounding where it disperses into polymer matrices to achieve consistent pigmentation.

PY73 is available in standard pigment grades compliant with REACH registration requirements for supply within the European Economic Area. It is offered in powder form, typically in multi-layer paper sacks or fibre drums. No E-code or food-contact designation applies to this substance.