So, let's start with the
lace. As you know from perhaps stitching regular
one-color lace, you need an empty bobbin to wind with
your thread color so the lace is the same color front
and back. For multi-color lace, you’ll need as many
bobbins as you have colors.
For our two-color mask, I have black and red thread, and
two empty bobbins waiting to be wound.