Recently, the Duut Rock Inscription or known as Tsogtiin Khadnii Bichig (Tsogt Prince's Rock Inscription) located near the Tuvkhun Mountain in Delgerkhaan sub of Tuv aimag was found to have been damaged by milk and oil splashes, resulting in more than 70 per cent of the inscriptions being obscured. The rock inscriptions, which have been under state security since 1971, date back to 380 years ago and are preserved to this day. A team of skilled conservator-restorers from the National Center for Cultural Heritage have also worked at the cultural heritage site to scrape and disinfect the Duut Rock dirt and stains. The team has refurbished the rock inscriptions using treatment and restoration methods based on various laboratory studies. The Duut Rock has a 30-line poem inscribed on it by Daichin Khia and Guyin Baatar in 1624 by an order of Tumenkhan Tsogt Taij, a 16th-century nobleman of the Khalkha Mongol. The rock assumed its name Duut Khad (singing rock) because it has a deep root under the surface of the ground and when it's struck it creates a sound. Those responsible for the destruction of the artefact of cultural heritage have not yet been identified. source from: montsame