http://www.answerbag.com/profile/29352 New Answerbag answers from mike scholtes Tue, 29 May 2012 16:43:31 -0700 Tue, 29 May 2012 16:43:31 -0700 http://www.answerbag.com/a_view/23612 Why does oil create a rainbow film when mixed with water?<br /><br />This phenomenon, called iridescence, occurs because the thickness of the film is comparable to the wavelengths of visible colors of light. Light reflecting from the rear surface of the film combines with the light that reflected from the front surface, but since the light traveled at a different... Fri, 17 Jun 2005 14:22:10 -0700 http://www.answerbag.com/a_view/23612