Imprimatura
Imprimatura is the first layer of paint applied onto white background (usually gesso). The paint can be diluted with turpentine or another solvent to achieve a thin, transparent layer.
Plein Air Landscape Paints: Cinnabar Green
Cinnabar green is warm green, a great color for painting sunlit grass and foliage. Looks chromatic, but it is actually pretty delicate and natural-looking
Plein Air Landscape Paints: Green, Green, Greener!
These colors provide for a great range of greens for summer plein air landscapes.