The correct answer is: Lacquer.
Rogan art is a traditional Iranian art form that uses a unique paint derived from lacquer. The paint is made from a mixture of natural resins, gums, and pigments, and it is applied to metal surfaces in a series of layers. The final result is a highly decorative and durable finish.
Castor oil is a vegetable oil that is derived from the castor bean. It is a clear, colorless oil that is used in a variety of industrial and commercial applications. It is not used in rogan art.
Mineral pigments are natural or synthetic substances that are used to color paints. They are typically ground into a powder and then mixed with a binder, such as oil or water, to create a paint. Mineral pigments are not used in rogan art.
Indigo is a natural blue dye that is derived from the indigo plant. It is used in a variety of textile and fabric applications. It is not used in rogan art.
Lacquer is a natural resin that is derived from the sap of the lacquer tree. It is used in a variety of decorative and protective applications, including furniture, musical instruments, and art. It is the main ingredient in rogan art.