How do you do intarsia?

At its most basic, the difference lies in where the colors are in your pattern. If the colors run across the width of your knitting, you’ll be working stranded, or Fair Isle knitting. If the colors are more blocked off, and don’t show up throughout the row, then you’ll be doing intarsia knitting.

Knitting Help – Intarsia

Intarsia Knitting with Edie Eckman | Creativebug

Intarsia Knitting Tutorial