To make this thread 'findable' by keyword searching, the list of inks are:
- Kobe INK Story #38 Kitanozaka Night Blue
- Kobe INK Story #44 Sumaura Seaside Blue
- Kobe INK Story #46 Nagisa Museum Gray
- PenBBS ink #234 Garnet
- PenBBS ink #257 Black Tea Latte 紅茶拿鐡
- PenBBS ink #274 Obsidian
- PenBBS ink #283 Petra
- PenBBS ink #286 (Quiet) Mountain at Nightfall 幽山向晚
PenBBS ink #257 has an astounding level of water resistance, but it's also the only ink that causes the nib to seemingly write one to two nib width grades wider. On some other papers that usually deal with fountain pen inks very well, I see quite a lot of spreading and feathering with that ink.
PenBBS inks #274, #283 and #234 are relatively dry compared to #286 and Kobe INK Story #38, #44 and #46 but still more than usable in a fine-nibbed pen. However, PenBBS ink #234 is apt to completely disappear off the page when soaked. The Kobe INK Story inks in the above selection have a reasonable level of water resistance (and that's one of the deciding factors why I chose them when making my recent purchases), but I wouldn't count on being able to read what was written if the page gets wet from a light sprinkle from the heavens above.