When you want to add a "blob" of color to your knitting, especially circular knitting, duplicate stitch is an easy way to add the design after-the-fact. In this video I demonstrate both intarsia and duplicate stitch.
The heart chart I use in the video can be found here on my website:
http://verypink.com/2016/06/15/intarsia-vs-duplicate-stitch/
Information on things you'll see in the video:
The yarn I used for demonstration is Knit Picks Wool of the Andes Bulky.
The needles I used are Knitter's Pride Bamboo DPNs.
The stitch markers I used can be found here:
https://www.etsy.com/shop/DreamingAlice
The nail polish I'm wearing is by Julep, color "Janie":
http://refer.julep.com/s/stacip