Normal increases and decreases can lead to ‘holes’ appearing in the crocheted fabric as they stretch the underlying stitches. While this looks okay in many projects, it can cause issues in amigurumi as stuffing can begin to fall out of these larger holes. Therefore amigurumi uses the Invisible Double Crochet Increase and decrease. Once I learnt this technique i have used it in many other projects.
Firstly the Invisible Increase
The invisible increase is achieved by making the first double crochet in the back loop and the second double crochet in the front
loop of the same stitch. Once you do the first double crochet in the back loop, this can result in the front loop being pulled tight and can be hard to get into. I often use the back of the neck of the hook to pull up the loop and then work through it rather than trying to push the tip of the hook through. (I have also seen some designers vary this by making the second double crochet through both loops).
This method stretches the top of the underlying stitch in two places at different rates rather than one place and allows the hole to be filled with the stitch worked in the front loop.
To make the invisible decrease, insert your hook under the first loop of the next stitch, and pull your hook forward to give it a little bit of stretch. Then insert your hook under the first loop of the following stitch. Complete your double crochet as normal. (I have also seen some designers vary this by inserting their hook under both loops of the second stitch.) I personally like using the first loop of both stitches.
This method allows the unused front loops to cover the holes that would otherwise appear as you are only stretching the back looks.
Things to watch for when using these invisible techniques:
