A step by step tutorial to “purl through back loop”. Learn PTBL the easy way
So, your pattern tells you the purl one through the back loop to create a twisted stitch on your needles? But how do you knit it?
In this tutorial, I’m going to show you exactly how to purl through the back loop – step by step.
ⓘ In knitting patterns, this stitch is abbreviated with Ptbl. There is a corresponding Ktbl, knit through back loop, stitch as well.
STEP BY STEP: PTBL INSTRUCTIONS
Purling through the back loop is not much different than the regular purl stitch and creates almost the same stitches in your pattern. They use a bit more yarn and appear a bit twisted. Here’s how you knit Ptbl:
Hold the yarn in front of your work as you would for a normal purl stitch.
Step 1: Insert the needle into the back leg of the first stitch on your left needle from right to left (you could also say from behind).
Step 2: Wrap your needle around the working yarn counter-clockwise (just the way like you would normally purl).
Step 3: Purl the working yarn through the loop and slide off the stitch from your left needle.
And that’s it. That’s your purl through the back loop stitch. It’s quite simple.
Make sure to keep a nice tension on your working yarn and use one finger to bring the yarn even further to the front (see picture step 2) so pulling the yarn through is as easy as possible. Then, you can knit those stitches more or less as fast as regular purl stitches with a little practice.
Good to know:
Sometimes your pattern requires you to ‘purl yarn over through back loop’. The technique is absolutely identically. Instead of a purl stitch you have a yarn over on your left needle. Again, you have to find the back loop of that yarn over, insert your needle from right to left, and purl it.
So, what do you need the Ptbl for?
If you are knitting a flat piece, your chart sometimes doesn’t show you the return rows and simply states “knit every stitch as they appear” (or something similar). So, if you see a twisted stitch (as a result of a Ktbl in the first row) in the return row, you will have to purl through the back loop so it will appear correctly in your pattern. A twisted rib stitch is a perfect example, but there are others.
Also, if you see a twisted purl stitch on your needles the other way where one shouldn’t be (typically after you picked up stitches after frogging or when you turn the heel of socks, etc), you can knit this twisted purl stitch through the back loop to rectify that mistake.
Purl 2 together through back loop
Sometimes patterns require you to purl two together through the back loop. You’ll knit this exactly the same as above, but in this case, you’ll pick up two stitches from behind instead of just one. First in the second stitch on your left needle, then into the first stitch (sounds like two steps, but it’s one motion). It can be a bit tricky to insert the needle into the second stitch, but you can use the tip of your needle to loosen it up a bit from the front if you really can’t fit in.