I love working in the back bump of the starting chain. I find it gives my starting chain a lot more elasticity and leaves me with a lovely finished edge for my projects.
It is very easy to do once you know where to find the little loop.
See how I am working behind the starting chain in the above photo?
When I roll the starting chain over you will see the little bump on the back.
This is the “back bump” often referred to in crochet patterns.
You simply slip your hook beneath the loop and work the stitches indicated in the pattern.
To see a comparison between the different ways to work into the starting chain please visit this post: