Txs you all for your reactions so far.
@ miss_thenorth. I live in Friesland, but i'm regular Dutch.
Of what i see in that old movie is that it's a very soft en supple moleskin they get. If i tan with alum it's hard, and if i preserve with spriti it's soft.
But as far as i now know. Alum...
I'm from The Netherlands and just started to learn about tanning moleskins.
I'm looking fot ways of home tanning and found a video about an old tannery. They tell about a dying (?) bath in which the hides go. Because i'm not a native speaker i don't understand what kind of bath that is.