The Supreme Court on Tuesday expressed concern over the Taj Mahal's colour turning brown as it pulled up the Uttar Pradeshgovernment and the Archaeological Survey of IndiaAsking if anybody had any clue about the colour of the white marble monument turning brownish, a bench of Justice Madan B. Lokurand Justice Deepak Guptaasked the Central Governmentto take the assistance of Indian experts or from abroad to see the extent of damage and if it can be reversed and the steps that can be taken to check it.The court expressed its concern after petitioner-in-person M.c. Mehtaproduced some photographs showing that the Taj was turning brownish. The court was hearing an application for the cutting of trees in the Taj Trapezium Zone.On February 8, the top court sought from the State Governmenta detailed vision document for protection and preservation of the centuries-old monument.It also inquired why there was a "sudden flurry of activities in and around the Taj Mahaland the Taj Trapezium Zone (TTZ)" and why leather industries and hotels were coming up there.During its February 8 hearing, the court directed the Uttar Pradeshgovernment to give details of the number of trees planted in and around the Taj Mahaland in the TTZ -- a 10,400 sqkm area spread over the districts of Agra, Firozabad, Mathura, Hathrasand Etahin Uttar Pradeshand Bharatpur in Rajasthan.On December 8, 2017, the court asked the State Governmentto plan for the protection and preservation of the Taj Mahaland the environment around it so that the historic monument could be there for another 400 years and not just for a generation.