Cut the cloth into 12 cm squares.

Insert a running stitch with the desired color thread 1cm inside the edge of the fabric (start and end with reverse stitching).

Stitch 3-4 running stitches on all edges (even if they are uneven or tangled threads, leave them as they are).

When you have finished piercing, pull out the thread from the edge of the fabric (about 1cm) using a curve perforator, cut the protruding thread, and align it to finish.