I forgot to clean the second half of the chip. This gives some idea how mucky things are at small scales.
File name : /home/richardk/web/photos/2007/12-30/8635.jpg File size : 463985 bytes File date : 2018:08:12 20:42:39 Camera make : Canon Camera model : Canon EOS 350D DIGITAL Date/Time : 2007:12:29 21:32:23 Resolution : 900 x 600 Flash used : Yes (manual) Focal length : 65.0mm Exposure time: 0.0050 s (1/200) Aperture : f/11.0 ISO equiv. : 100 Whitebalance : Auto Metering Mode: pattern Exposure : Manual Exposure Mode: Manual JPEG Quality : 97 ======= IPTC data: ======= Record vers. : 2 Keywords : macro Keywords : microchips Byline : Richard Kettlewell