FOREST PRODUCTS. This undated photo shows barks, leaves, and resins of forest species after oil extraction that will be used by the Forest Products Research and Development Institute (FPRDI) in developing incense products using hydrosols and solid residues in Laguna. The FPRDI will also study the incense products' ability to repel insects. (Photo courtesy of FPRDI director Romulo Aggangan) MANILA - The Forest Products Research and Development Institute (FPRDI) is currently developing incense products using residues from extracted and processed forest materials, its chief announced Friday. "We are targeting to develop incense cones and incense sticks, using hydrosols and solid residues from barks, leaves and resins of raw materials or forest species after oil extraction," FPRDI director Romulo Aggangan told the Philippine News Agency in an interview. Aside from being fragrant, the incense products will be assessed to determine their ability to repel insects such as mosquit