Crayons are most often used by children on various types of paper, such as notebook paper, art paper and posterboard. They are available in a wide collection of colours ranging from primary colours to fluorescent colours. They are formulated from combinations of waxes, colourants, colour extenders and other additives. Figure 1 shows some of the commercial crayons available in the market. It was reported that on average, a child in America wears down 270 crayons by his or her 10th birthday.

Main Researcher: Dr Ooi Tian Lye