Harlequin (pattern)

This blackwork stitch consists of horizontal diamonds, hence the name ‘Harlequin’ after the costume of the pantomime character.
Method
1
Make a diagonal stitch across four threads and down one thread from top left to bottom right.
2
Bring the needle up two threads below where you started and make a diagonal stitch across four threads and up one thread; take your needle down in the same hole as the end of previous stitch.
3
Repeat the last two steps to complete a vertical row of zigzags.
4
Work the next vertical row by completing the diamond shapes: stitch a mirror image zigzag which shares the holes of the first row.
5
Continue working up and down across the shape to complete the pattern.

Embroidery Techniques
References
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Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.154