Large grid-ruled Candy Code 4-subject Notebook
Each page's ruling, heading box, and right margin are printed in one of four colors: orange, green, red, or blue. I would prefer one color per notebook, but Miquelrius' one-subject notebooks have far fewer sheets.
Bleedthrough is non-existent with all of the pens (extra fine, fine, and medium nibs) and inks I've used with this notebook. Feathering with extra fine and fine nibs is non-existent, and with the lone medium nib I tested it is minimal. Showthrough is minor with extra fine and fine nibs, except for my wettest fine which causes moderate showthrough.
Pens and inks used in the photos below:
Pilot Prera fine, KWZ IG Red no. 3
Pilot Prera fine, R & K Solferino
Pilot Prera fine, KWZ IG Turquoise
Waterman Phileas extra fine, Iroshizuku Kon-peki
Waterman Phileas extra fine, Namiki Blue
Pilot Custom 74 fine, Iroshizuku Aji-sai
Pilot Custom Heritage 92 fine, R & K Alt-Goldgrun
Pilot Custom 823 fine, Iroshizuku Fuyu-syogun
Bexley Jitterbug fine, Iroshizuku Yama-budo
Aurora Ipsilon fine, KWZ IG Green no. 4
Pilot Varsity medium, turquoise ink