Knitting intarsia in the round is very
much the same as knitting it flat. If you're not familiar with knitting intarsia flat, click here for an earlier tutorial. Both of these lessons are from my Intro to Colorwork class, available at Rhinebeck, Toronto's Creativ, and other festivals this summer and fall.
The best way to do this is to just do it. We're going to make a quick swatch. You'll need two circs of the same size, and three colors of yarn in a corresponding weight. Cast on 15
stitches in color A on one circular needle.
Cast on 15 stitches of color B on another circular needle. Now, holding the needles together with A in
front so the working yarns both come from the right side,* twist the 2 yarns
together. Knit across A with A. Do not turn.
Purl across B with B. Turn. Twist the yarns together once. Purl across A with A. Do not turn.
Knit across B with B. Turn.* Repeat
these two rounds.

As you can see, essentially you’re
working each color as you would on
straight needles. The only change is
that you need to twist the yarns together at the end of each row, just like you
did in intarsia. Several rounds of this
process produces a tube which is one color on one side and a different one on
the other. The same basic technique can
be used to achieve simple intarsia patterns in the round that don't end at the end of a needle. You just work the same technique one color at a time.
Now let’s introduce a third color. On the A color side, let’s knit every second
stitch in color C, and keep everything else the same. When we turn the work to purl, we’ll work the
A stitches with C, and the C stitches with A.
You are building a tiny checkerboard pattern, which will be a little
tighter, and twice as thick, as the fabric on the other needle. This technique can be a practical benefit
when done on only one of the two needles.
This type of color combining creates a
beautiful effect in socks, mittens, hats, sleeves, and any other knitting in
the round. Spice up a single colored
pattern, or reinforce palms and soles of the feet. By adding a second yarn to the “wear” side of
a garment, you’re adding life by adding durability. And it’s always nice to do it in color.
Of course, if you wish, you can perform
this two color technique on each needle. When
working in this way, each color needs to stay on its own needle, so even if you
wanted to use color C on the front and back of the work, you would need to be
working from two separate balls of C, just like you would in flat intarsia.
Work this swatch until you create neat, firm, closed seams between colors that do not pucker. The only way to even out your tension at the color changes is to practice. Once you have it, it's like riding a bike - you'll never forget it!
Work this swatch until you create neat, firm, closed seams between colors that do not pucker. The only way to even out your tension at the color changes is to practice. Once you have it, it's like riding a bike - you'll never forget it!