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When designers are sketching they need to carry many
different colors and brightness of markers. If you suddenly had
an idea but there are not enough markers, the expression effect
will be affected. E-mark is a marker which works as the principle
of inkjet printers. There are four replaceable cartridges and a 24
-color and 24-brightness rings at the top, which can provide you
576 different colors.
Qinghua Chen , Tuo Zhou, Yu Liu, Xiaowei Jiang