Faber castell Pitt Artist Pens Compatibility and Coloring tests on Canson Fanboy Drawing Paper

Still wondering how did I miss that the color range of the Faber Castell Pitt Artist Pens consists now of 58 colors in both the original and Big Brush formats. Thus I decided to test my current sets on the Canson Fanboy drawing paper for compatibility with two pigment liner pens (Copic Multiliner SP and Sakura Micron pens) and two types of technical pens (Staedtler Mars Professional Technical Drawing pen and the Koh-I-Noor Rapidograph technical pen).
Even though the ink of all of these pens is supposed to be waterproof once dry, the Big Brush 103 Ivory pen noticeably smudged the lines drawn with the 0.45 mm Sakura Micron 05 pen even after they had dried overnight. The lines drawn with the 0.7 mm Staedtler Mars Professional Technical Drawing pen dried a bit quicker but still smeared a bit specially under the hairline in the example on the lower left corner. The 0.25 mm Koh-I-Noor Rapidograph lines dried pretty quickly, but the mouth and nose strokes on the lower right example were not allowed to dry long enough since they smeared on one side upon contact with the 132 Light Flesh Pitt pen. The Copic Multiliner SP pens outlines did not smear at all when brushed with juicy Pitt pens after having dried overnight. The Faber Castell Pitt Artist Pens are efficient and convenient sketching and color drawing tools given their lightfast, odorless, waterproof, and richly pigmented India inks that do not bleed through the paper and worked reasonably well in combination with most pigment liners and technical pens tested. I would just avoid using them with the Micron pens to avoid any unwanted smudging of the black outlines. The Pitt inks can be difficult to blend and apply evenly when coloring over larger areas though. Worth trying.