A good black ink, opaque fluid

A good many black ink, fluid, fast drying and covers well. Also tested four other colors of this excellent French brand:
- Azure blue, very bright, very bright, to use annotation or "fluotage" or with a "large" pen (much "relief" in this case)
- Gray cloud, very light, very "gray" but very "cloud" too :) Use with very oily pen, like "italic", it is superb. Unusable with a fine point, that would be unreadable.
- Night Blue: a beautiful dark blue, almost black / gray. Perhaps my favorite.
- Moon dust. The school purple from our parents and grandparents. Cover perfect, rich in pigment, fluid and fast drying. A beautiful purple!