Type 4 Flake. These flakes are grey, often irregularly shaped, and
do not have a mosaic structure. The Type 4 Flake is approximately
0.15 mm in diameter, and at its periphery are a number of light-reflecting
ball-shaped particles up to 5µ in diameter. Granular production
has not been noted. The air bubbles to the left and right sides of
this photograph are artefacts. Diagnosis: Subjectively healthy individual.