JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 20. A sequence photographed during a 'runnlng-loop' break at the root end of a hair fibre. Note how initial fracture of the cuticle is circumferential and the cortex begins to fracture transversely. As the loop 'runs', the fracture continues longitudinally.
JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Figure 21. A sequence showing a 'running-loop' break at the tip end of a fibre. Longitudinal splits develop quite early in the process leading to a separation of the cellular structure.
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