This edging is my motif #9.
Here are the instructions:
Using ball & shutle thread,
Insert a steel crochet hook through the edge of the hanky, pull the ball thread through the fabric.
* Pass the shuttle thread through the loop and tighten the loop. Now work a ch of 4 ds, 3 p sep by 2 ds, 4 ds.
Insert the hook through the edge of the fabric at a distance of about 3/4 cm in such a way the chain forms a small acrh and pull the ball thread throughthe fabric using a crochet hook as before. Rep from * and work around the hanky.