I Taught a class in Double Knitting on Tuesday and figured since I made up the whole tutorial I may as well share it!
This technique creates a thick, double-sided fabric with two “Right” sides. It is usually used to do double-sided stockinette, especially in contrasting colors. Applications include reversible scarves and blankets, hats, and lined mittens or socks. In the picture, the back side looks just like the front except the backgroud is red and the heart is gray.
Double Knitting was used to create the Checkerboard Rhino Scarf as well.
For this class you will need two balls of worsted weight yarn in contrasting colors (Main Color (MC) and Contrasting Color (CC)) and size 7 or 8 straight needles.
Basic Double-knitting technique, using this heart chart. To read the chart, read from the bottom right to left on odd rows, and left to right on even rows:
Cast on 9 stitches using the long-tail method, holding both strands together as one.
Set-up row: On the next row use the right needle separate the MC loop, and knit it with the MC working yarn. Move both strands between the needles and purl the CC loop with the CC working yarn. Repeat for each stitch, separating the two colors for the rest of the row. You should now have twice as many stitches, and they should alternate MC, CC.
At the beginning of each row, twist the MC yarn behind the CC yarn for the first stitch. This ensures that your two layers are joined at the sides:
(the Red is the MC in the photo)
Each square of the chart represents TWO stitches, one on the front and one on the back. The color shown is the color you knit when you are on the RIGHT SIDE. MC is the background color, the first stitch of the row, and CC is the motif color. When you change colors, you must keep the stitch-pairs together, for example, row 2 (on the WRONG SIDE) goes (pmc, kcc), (pmc, kcc), (pmc, kcc), (pmc, kcc), (KMC, PCC), (pmc, kcc), (pmc, kcc), (pmc, kcc), (pmc, kcc).
Continue this way, following the chart.
Double-knitting Bind off: Slip the right needle through both loops of the first stitch, the MC and the CC and k2tog. Knit the next stitch the same way, then bind off. Continue the k2tog bind-off across the row.
Double-knitting benefits from a good blocking after you're finished.