The art of essential oil blend it's a subtle and thoughtful process that I often compare to the individual layers added to a painting. Just as each brush stroke on a canvas gradually builds upon the layer of paint below to create a harmonious result, creating essential oil blends applies the same principle. In the world of perfumery and essential oil blending, the three familiar layers of “ink” are known as aromatic notes, which include major grades, intermediate grades, and basic grades. Underneath these blended layers, you'll find base notes.