Cumulus is part of our second magnetic collection, The Nephology Collection. It has a muted green/blue base and is filled with silver magnetic pigment. The perfect polish for a that beautiful velvet effect. It is part of the Nephology Collection which can be found here. Nephology is the study of clouds and each of these polishes are named after cloud classifications. Cumulus clouds are puffy cotton like clouds. They generally do not precipitate and are a sign of good weather. Use a good base and top coat to get more durability and longevity from your manicure! Magnetic Polishes: You will need a magnet, such as neodymium, in order to move the particles around.