Hello all, I'm looking for a polymer which I can spin on, is transparent to visible light but whose film properties, such as the refractive index, change with time e.g. water absorption into the film. Does anyone know such a polymer? Thanks, James -- Dr. James Paul Grant Postdoctoral Research Associate Microsystems Technology Group 74 Oakfield Avenue Room 205 School of Engineering University of Glasgow Glasgow Scotland G12 8LS Telephone: +44(0)141 330 6690