To best match the two color cast on you want to work a bind off like this on your finished double knitted project.
In this DROPS video we are holding the 2 strands together, knit first 2 sts together, *k2tog through the back loops, then slip the 2nd st on right needle over 1st. Repeat from * across, after last stitch has been slipped over, cut yarn and pull through. Weave in ends.

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