Although there is no official term for it, there is such a thing known as gradient blending, which is created by two or more colors gradually blending into one another. This is often seen in embroidery, however this technique can be applied in all manners involving color.
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Black and White are Colours Because They can Be Mixed To Create A New Colour. they are also colours because you can actually see them, if they were not colours then you wouldn't be able to see them. the only reason why they are not colours because they are shades
Pochahonos
white
Contrasting colours. E.g. Red and green, blue and orange, yellow and purple.
"watercolours and transparent inks, using brushes, pencils, technical drawing pens, and a scalpel (for scratching). I also use a very special tool called an airbrush which actually sprays colours onto the [illustration] board". From http://us.penguingroup.com/nf/Author/AuthorPage/0,,1000002108,00.html