typical reflectance curves for red paints

 
saturated "spectrum" red

A "spectrum" red paint reflects no blue light, only light from the "red" end of spectrum; the hue ranges from red orange or scarlet red to deep red. These paints appear brown if darkened, hue shift toward yellow if diluted, and mix relatively dull purples with blue paints.

  saturated "blue" red

A "blue" red contains some blue reflectance, even when the hue is the same as a spectrum red. These paints appear somewhat maroon if darkened, hue shift toward magenta if diluted, and mix relatively brighter purples with blue paints.

 

cadmium red light (scarlet)

 

cadmium red medium (red)

 

cadmium lithopone red deep

 

pyrrole red

 

 

 

quinacridone red

 

quinacridone pyrrolidone

unsaturated "spectrum" red

 

venetian red

 

quinacridone maroon

 

  unsaturated "blue" red

 

perylene maroon [lightfast]

 

alizarin crimson [not lightfast]