If that rang a bell for you, it might be via Baumgartner Restoration [0], the excellent painting restoration YouTube channel. He refers to it as "Japanese mulbe

If that rang a bell for you, it might be via Baumgartner Restoration [0], the excellent painting restoration YouTube channel. He refers to it as "Japanese mulberry paper" and IIRC relies on it for its light weight but reliability. [0] https://www.youtube.com/channel/UCvZe6ZCbF9xgbbbdkiodPKQ/videos https://www.youtube.com/channel/UCvZe6ZCbF9xgbbbdkiodPKQ/vid...