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I saw that Kanayama documentary (Made in Japan) & he impregnates a grey powder into the strops toward the end (w/ something that looks like beeswax). This is the leather side, now, but I remember...

Would love to find a linen like that! Any suggestions on where to look/what brands/markings might be it? My guess is those old linens were treated w/ something super slow & fine that does remove...