INDORE: Rupali Nirapure , a 20-year-old folk dancer who has performed across the globe and on national TV, was partly blinded by a chemical thrown at her by a spurned lover in Indore 's Banganga area on Tuesday. She was attacked just hours before she was scheduled to go to USA for a concert.The 'acidic chemical' damaged her corneas and has already reduced her vision by 25%, say medical sources and police. But the chemical left no marks on her face. Police are yet to confirm the nature of the liquid thrown at Rupali. The accused, Mahendra alias Monu Sen, met Rupali in dance class and was pressuring her into marriage although she refused repeatedly, say police.Rupali is popular for her folk dance and has participated in dance contests on national TV channels. The attack, caught on CCTV, happened around 12.40pm, said her father Basant Nirapure. Rupali was at home when Monu called her on mobile and requested to meet outside her house. She agreed.CCTV footage shows Monu waiting on the street outside her house, his face and head covered, and holding the chemical in a glass. As soon as Rupali stepped out, the attacker approaches from behind, throws the corrosive chemical at her face and runs away.