Interesting...they look like copper nails, but the lighting and ISO info have me intrigued and wondering if they are in fact copper or if they just appear that way because of the light.
@gardencat - It must be the light. These are plain old 4d finishing nails. I set my camera for no flash which upped the ISO to 5000 and I used two of my extension tubes totaling 32mm to zoom in tight. I laid the nails on a cd to get the colors.
