Driving a new vehicle with a temporary registration number pasted on the number plate will now be an offence. The road transport ministry has also notified comprehensive norms for colour code for alphanumeric details of the registration number and the background of the number plate for 11 categories of vehicles.

from Times of India https://timesofindia.indiatimes.com/india/norms-for-temporary-registration-no-in-new-vehicles-kicks-in/articleshow/77009228.cms