รThe visual effect of increasing laser labeling exposure time on
tangerine peel is shown in Fig. 2. At the lowest possible exposure
time of 30 µs, the label was faint and hardly visible, whereas at
the highest exposure times, the etch markings merged into solid
lines. Calculations of laser etched surface area were done using
image processing software. In general, the area covered by the
etched markings increased with increase in exposure time