Pen: Lamy Safari EF
Paper: Rhodia Dotpad 80gsm
Number 4 in the Perfect Grey Ink countdown is Iroshizuku Fuyu-Syogun. Fuyu-Syogun or, "Old Man Winter," is a blueish-grey ink that is lightest in color of the 5 inks I tested. Not unlike De Atramentis Charles Dickens, Fuyu-Syogun is not quite as grey as I would have liked. There is a very prominent blue hue, which reminds me of rain clouds - the name Old Man Winter suits this ink well.
Like all Iroshizuku inks, Fuyu-Syogun is nicely lubricated and behaves well. Similar to Iroshizuku Ku-Jaku, this ink has a nice red sheen around the edges of the ink splatter. It has moderate shading and does not feather or bleed. Dry time was slightly longer than De Atramentis Charles Dickens at 7 seconds.
You can pick up a 50mL bottle of Iroshizuku Fuyu-Syogun at Goulet or a similar retailer for $28.