These two inks are fairly similar. Both are dark saturated blue-blacks with a hint of green. Verdigris definitely is a bit greener than Denim but it is hard to be seen for finer nibs. An interesting feature of Verdigris is its color change when drying. There is much more green in the wet ink which mostly disappears when it dries. Let's show some comparative images. Unfortunately, my scanner seems to be unable to catch the subtle color differences. This is on Rhodia paper: http://s8.postimg.org/k5xskpgs1/denim_verdigris_rhodia.jpg And this is on my workhorse paper (cheap Spoko College Block): http://s18.postimg.org/w5p0dz3np/denim_verdigris_spoko.jpg I did not observe significant differences in behavior of these inks. Denim may be a bit drier and has less tendency to bleedthrough. Verdigris is not horrible in this aspect but you can see some bleedthrough of it on the reverse of Spoko paper: http://s21.postimg.org/je6byp4k3/denim_verdigris_spoko_rear.jpg Here are photographs (not scans) of details on the Spoko paper. I believe the subtle color difference is more visible here: http://s22.postimg.org/pwpcee9l9/denim_verdigris_detail_2.jpg http://s22.postimg.org/xl8ekw5xp/denim_verdigris_detail_1.jpg Which one do I like better? Hard to say. The differences seem to be minor to me so I would call it a draw. If you like blue-black inks, both deserve your attention.