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]