This is more like the regular blue I know (lol) taking longer time to dry, and relatively wetter than the standard BBK.
As other IG ink, this ink will change color, too. Initially, it was dark blue (similar to Azure #5) and then about 15 sec later when iron started to oxidize, it turned to almost black blue. Comparing to Diamine Register’s ink (which is also BBK), IG BBK still has the blue-ish tone while Register’s ink only showed gray iron trace after dried.
It has better water resistant than other IG ink from KWZ I tried and this is more useful than the standard BBK – at least there is no hint of purple that might get into trouble at work…
CP value: 90/100, much better and useful color than standard BBK