Any yarn sizejust make sure it is smooth so you can see your stitch easily.
Hook size recommended for your yarn size.
Abbreviations (US terms)
Single crochet - sc
Chains - ch
Back loop only - blo
Notes
Appearance: Creates a textured, ribbed look, often with a horizontal line showing on the surface.
Usage: Commonly used for ribbing for clothing, garments and gloves, as well as amigurumi to create perfect lines like with my crochet frog pattern.
Stitch: Can be used with any foundational crochet stitch - sc, hdc, dc, tr etc.
Instructions
Chain any length you wish.
Row 1: In the second chain from the hook, make a sc. Sc for the rest of the row. Then ch x1 and turn.
This is your foundation row and is done normally. After this we will be working our stitches in back loop only.
Row 2 and beyond: When working a “normal” sc stitch there are 2 loops at the top of the stitch and you go through both loops. For blo, you skip the first (the front) loop of the stitch and go directly into the other loop, in the back, farthest away from you. You do not go through the post - just the back loop.
Then make a sc like normal - pull up a loop, yarn over, and go through both loops on the hook to complete the stitch.
This should leave a horizontal bar exposed and can be more noticeable after completing a few more stitches.
Complete the row, ch x1 (or more depending on the stitch you are making) and turn. Repeat for as many rows as you would like.
You can also do this for front loop only (flo). Flo is completed just like blo, but in the front loop. You just insert your hook into the front loop, making sure to ONLY grab the front loop, and complete the stitch like normal.
And now you know how to do the crochet back loop only and front loop only!