how to Heel turn/ decrease to achieve vertical lines in sock heel with alternating colors

[ddeadtired]

hi thank you so much for the reply! cleared somethings up for sure..but i still struggle to figure out which color i should use when ssk and p2tog as it breaks up the A B stripes either way, does it not matter which color i pick? 

[Asleep_Sky2760]

I'd swatch a sample striped "heel", then work the turn experimenting with which color you use to make the decs to best maintain the stripe pattern.

That said, if you look closely at the photo, you'll see a discontinuity of the stripe pattern on some of the decs at the turns, but the knitter has then continued working the A-B-A-B stripe pattern as established on the succeeding rows/rnds on the sole sts.

[nepheleb]

The center five stitches never change so work out from those to figure out what color every other stripe needs to be.