When adding a new color, never knot! Instead, join new yarns neatly and invisibly at the beginning of a row. Knots have a way of coming untied and working themselves to the front of your work when you least expect it. We recommend this method: Place the needle into the stitch, dropping the old yarn and picking up the new yarn, leaving a 4-inch tail to be woven in.
This method of casting off was developed to compliment the look of the long tail cast on. By sewing the tail of your yarn through the stitches, you can create a finished edge that perfectly mirrors the long tail.