Pilot's Frixion Colour erasable colouring pen is a step ahead of the competition thanks to clever ink which turns transparent when subjected to friction. No eraser dust, and the line disappears very cleanly leaving only a faint impression of the erased line. The ideal way to erase is using the built-in eraser, though most hard plastic works OK. The Frixion Colour pen features a broad 1.0mm tip and is available in 12 colours.