The black abstract material which sticks to inside crack of the sample machined by wire-electrode cutting is analyzed and studied by using scanning electron microscope and X-ray energy spectrometer.

The black material is considered as carbon deposition, which is formed by oily-liquid medium fission product (mainly carbon black) covering inside crack during the discharge process of pulse current.

First the shell begins to crack. Then there's a flurry of activity as the tiny creature curled up inside the egg breaks a hole in the shell.