The author makes use of the term and then explains it, so I assume it is not a widely known term. I haven't been able to locate it in a dictionary or online.
He explains the process and what occurs, as I summarized. It seems more like a highlighting technique, which I naturally assumed was a specific stitch. This may not be the case.
Thanks for your comment! It is helping me to understand.
Best,
John
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what is this stitch/technique called? by: Valerie Kalyani (in watsonville)
Without knowing any more specifics, that is a tricky question. There are many stitches that can be worked this way. Chain stitch is seen on many old Chinese pieces, and so can outline or stem stitch. But I have never heard a term specifically for work that does not go through or show on the reverse of the cloth.