This Hansa Yellow ranges from reddish yellow to greenish yellow with temperature shifts from cool to warm hues. It has good tinting strength and average to slow drying time.
This Hansa Yellow has excellent lightfastness, particularly in the darker shades.
Hansa Yellow has no significant acute hazards, though its chronic hazards have not been well studied.
Hansa Yellows were first made in Germany just before WW1 from a series of synthetic dyestuffs called Pigment Yellow. They were intended to be a synthetic replacement for Cadmium Yellow.
PBr41-Pigment Brown 41
organic, disazo condensation
disazo condensation brown
Pigment Brown 41 offers good covering strength and medium tinting strength. It is transparent and heavily staining. These properties are ideal for watercolor painting, where a transparent brown has traditionally been achieved by mixing other pigments.
Pigment Brown 41 has very good to excellent lightfastness.
Although no acute toxic effects are known, possible hazards of chronic exposure have not been well studied.
Pigment Brown 41 has been used to color paints and plastics. It one of a series of disazo condensation pigments synthesized and commercialized late in the 20th century.