The children were taught to draw by not exerting too much pressure on their drawing paper. One, they can erase the pencil marks easily. Two, they will prevent white lines from appearing when they are colouring. The lines are harmless but somehow they spoil the finished pieces.
The picture on the left shows a dent created on the paper surface when one exerts too much pressure while drawing. This dent is irreversible. The tip of a colour pencil is too broad to fit any colour in the dent, therefore a white line is often seen after colouring.
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