And just a minor nitpick Brienne closing the book right after writing with fresh ink, yeah that'll look great when i dries out
I said this in my nerd group but Westerosi technology is not necessarily the same as ours. Clearly, the same happened with Varys when he was sending letters out (writing and folding) and I'm sure has happened all throughout the series.
Westerosi Ink is Very Rapidly Drying Ink on their Very Special Paper for Rapidly Drying Ink. After millennia of basically the same customs, styles and technology levels, they're of course going to make the best with the technology they do have.
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"There's no cure for being a cunt." Bronn "King Stannis is my god." Davos "Who the fuck is Jon Snow?" Locke