Hi, Could anyone tell me where I can find a table of the colours which SiO2 layers make on Silicon at different thicknesses? Thanks Y. Yit-shun Leung Ki Graduate student (microfluidics) IMS-DMT, EPFL, Batîment BM, CH-1015 Lausanne (CH) Tel.: +41 21 693 7818 Fax.:+41 21 693 5950