Start by speed piecing the Quarter Square
triangles, stacking the Color 1 and Color 3 3-1/4" x
13" strips, right sides together and all edges aligned. On the
back of the top strip, lightly mark the 3-1/4" square lines and
mark the diagonals in the direction shown at left. Now sew a SCANT 1/4"
above and below the marked diagonals, pivoting at the square lines.
Now cut apart on the 3-1/4" square lines only. Using a
ruler and rotary cutter, cut each square on the opposite diagonal from
the way you sewed. Then cut apart on the drawn diagonal between the
rows of stitching. Each square will give you four quarter square
triangles. Press seam allowances towards the darker fabric...