I had never heard of that term, so I looked it up!
“Ring dyeing is a type of dyeing fault in which dyes are partially diffused to the interior of fibre. Most dyes are stained on to the fibre surface that form layer of dyes on to fibre surface. Thus around the fibre a ring-like appearance of the dye can be viewed cross-sectionally.”
I still don’t know what it means, LOL! :)
—”Ring dyeing... “
Same as ring spun cotton only different!
Personally am only familiar with the denim process. The white thread is dipped into dye one or more times.
This leaves the indigo dye on the outside.
As the fabric is worn and abraded, the underlying white thread shows through.
Got a book here from my days in a stonewash facility.
Will post some of their info if there is interest.