Been culling books and came across one that you might be interested in. Inner Peace Outer Beauty: Natural Japanese Health and Beauty Secrets Revealed by Michelle Dominique Leigh. It has a recipe for the infamous "Nightingale droppings" face treatment--the stuff is available as a powder, evidently.

Anyway, she seems to work from oral history, but the gal is a longtime reporter in Japan (works for the Japanese times).

If you're interested (it's free!), email me your mailing address! (Otherwise, it goes in the "donate to library" pile.)