Collection 100,Colour picker pen,

As a concept this pen is very nearly genius, such a brilliant idea. The technical side of it however, lacks certain thinking and science. The use of RGB ink cartridges combining to make any colour may be all well and good in the screen based world of colour, but print based media requires CMYK. Also for this pen to achieve its full 'any colour' goal a white and black cartridge would probably come in useful...