Nimbus is part of our second magnetic collection, The Nephology Collection. It has a muted lavender 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. Nimbus clouds are dark and gray clouds that are responsible for the majority of precipitation. 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.