It did not happen overnight, particularly as my binder spends most of the time being opened and closed rather than open on a desk.
But now my personal sized undyed leather Van Der Spek binder lies perfectly flat, even with no inserts!
This colouring is the result of 14 months of use.
And here we have it drying out after being snowed on. The heaviest snow in Stockholm in November in 111 years!