Impacts of different drying strategies on drying characteristics, the retention of bio-active ingredient and colour changes of dried Roselle by Tham, Thing Chai, Ng, Mei Xiang, Gan, Shu Hui, Lee, Suan Chua, Abdul Aziz, Ramlan, Chuah, Luqman Abdullah, Ong, Sze Pheng, Chin, Nyuk Ling, Law, Chung L.