Art Spectrum® Spectrum Yellow is a warm yellow pigment. It is part of the Yellow Hansa group of modern pigments first developed by the German Hoechst company in the early 1900s. It is a semi-transparent colour.

Pigments	Lightfastness	Permanence	Transparent/Opaque
PY74	ASTMI	**** (excellent)	Semi Transparent

ASTM Approved Permanent Colours American Society for Testing and Materials, conforming to standard D4302-90.