Achromatize
Verb (used with object), achromatized, achromatizing.
1. To make achromatic; deprive or free of colour.
(http://dictionary.reference.com/browse/achromatize)

Achromatize is a stockinette hat knit in the round on a circular needle using the magic loop method with a striped design fading one colour into another.

With small, medium and large options.

2 x 50g Aran weight yarn in two colours.