After inflicting a crushing innings defeat on Bangladesh in the Indore Test, Virat Kohli and Co. have extended their stay at the series opener venue by two days to have a full-fledged training under lights from Sunday, with an aim to get used to the "twilight" ahead of the country's first pink-ball Test at the Eden Gardens at Kolkata.

Even the Bangladesh team has also decided to stay back and utilize the time, which they have got because of an early finish to the opening Test, training under lights.

It has been learnt that for the next two days, the Indian team's focus will be on what is being called as "twilight zone", something that cricketers who have played with the pink ball, have acknowledged to be very challenging.

Many players who have played the Duleep Trophy, including Cheteshwar Pujara, has said that sighting the pink ball at twilight is a challenge as the crimson colour of the sky and the pink colour of the ball makes it look more like orange.

"In the twilight period, I feel that maybe sighting the ball could be a little challenging. (But) the more you play, you get used to it. It's always about experience and knowing how the ball is behaving," Pujara recent told PTI in an interview.

Ravichandran Ashwin had recently said that, at times, he is getting a feel of an orange ball.

"Obviously, it's a challenge to play with the pink ball. The ball has a lot more lacquer. I haven't even bowled a single ball with the pink ball. Obviously I just saw it. Sometimes I don't understand if its orange or pink, still coming to terms with that," Ashwin had said.