​Blister Check Knit Stitch

With colour A cast on a multiple of 4 sts + 1.

Row 2: with colour B, knit all sts.

Row 4: with colour B, knit all sts.

Row 6: with colour A, knit 2, * drop next st off needle and unravel 4 rows down, picking up colour A stitch from row 1 below; insert needle into this stitch and under the 4 loose strands of colour B, and knit, cathing the 4 loose strands behind the stitch; knit 3; repeat from * to last 3 sts, drop stitch, knit 2.

Row 8 to 11: as rows 2 to 5.

Row 12: with colour A, knit 4, * drop next st, unravel and knit colour A st from row 5 below in the same manner as row 6 was worked, k3; repeat from * to last st, knit 1.