Cheah Bok Eng, a 22 year old male from Penang, Malaysia asks on September 15, 2003,

May I know what chemicals can undergo esterization by absorbing sunlight energy at 33 degree celcius. I'm doing a project on producing aromatic products by utilizing the heat produced by sunlight and at the same time maintaining the temperature in a transparent box in which the chemicals are placed. If possible, please suggest low cost chemicals that are not too hard to find.