The baggage clearance at the major International Airports in India consists of two channels for clearance.
Green channel: not having any dutiable goods to declare.
Red channel: having dutiable goods to declare.
Remember: Non declaration & wrongful declaration of the dutiable goods may attract confiscation of goods, fine or penalty. Serious offences like attempting to smuggle Gold, without declaration may lead to arrest & prosecution. The Indian Revenue Department has specified a list of items, including the size that can now be imported duty-free as part of baggage.