Mont Blanc Blue Hour is a strange ink. it goes down a grey sort of blue but after a while it changes to a green, maybe a sort of teal. I actually did enjoy the blue it goes down as but I was in for a rude surprise when I open my notebook to find that the ink change into the weird green. Though I can never call Blue Hour a boring blue but the green isn’t all that appealing to me. I assume that Mont Blanc was going for the twilight but shouldn’t it go from orange to blue (maybe it’s impossible to get this colour change.) or even blue to black. Colour change aside, Mont Blac Blue Hour has shading and is a nice ink to use. Buyers beware of the colour change though.