This is a steel bulkhead plate eroded by poor chemistry

Camera Maker:	Hewlett-packard
Camera Model:	Photosmart M525
Shutter Speed:	7837/1000000 sec
Aperture:	f/2.9
Focal Length:	6.4 mm
ISO Sensitivity:	100
Time Taken:	2008:05:29 05:36:27
Exposure Compensation:	0 EV
Metering Mode:	Center Weighted Average
Flash Fired:	No Flash