Anytime that you need to shape your crochet project, you will need to use increases or decreases to increase or decrease the number of stitches. And increase doesn’t add extra bulk to your fabric but a traditional decrease adds bulk that is very noticeable to the trained eye. Take a look at the two graphics below. On the left, you will see the traditional single crochet 2 stitches together or single crochet decrease. The invisible method is on the right.
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Take a look at the difference side by side! The invisible sc2tog ends with only 2 strands of yarn, shown by the light gray lines, while the traditional sc2tog squeezes 5 strands into one stitch! That makes a big difference.