Crochet colourwork or tapestry crochet can be a fun way to add pattern to your work. While there are a few ways to do it, in our book Raw, the Newnham Hat and Mittens, the colourwork is workied in UK double crochet (US single crochet) in the back loop only. This gives a lightweight fabric and limits crochet's tendency to work on a bias.
Once you get the hang of it, crochet colourwork is quite easy, but as with anything, getting started can be tricky. To change colours, you work the last yarn over of the stitch before the colour change in your new colour.
Insert hook into stitch, yo with col A, pull through, yo with colour B and pull through.
As you work along the row, you carry the unused colour through the stitches and work over it.
In the Newnham Hat and Mitten patterns, you will read the colourwork chart from right to left.
1. Work up to the last stitch of the current colour.
2. Insert hook into the next stitch, holding the non-working yarn across the top of the stitches to work around it,
3. Yarn over with current colour and pull through
4. Yarn over with new colour and pull through with new colour.