What brown ink to go with this brown pen? : r/fountainpens

Pentel EnerGel Clena Gel Pen - 0.5 mm - Brown Ink - Brown Body

Limited Edition – Studio Neat

Caran d´Ache Varius Ebony Ballpoint pen, Brown, PVD Rose Gold, 4480.142

Leather Single Fountain Pen Case / Pen Pouch - Brown

Machine Era Pen | Original Brass

Cross Century II Black Lacquer Rollerball Pen

I found this lovely pen that writes with a beautiful brown ink that matches so nicely with every aspect of the pen itself being a shade of brown. I took it apart

Zebra Sarasa Clip Gel Pen - 0.5 mm - Brown

Resin Brown Fountain Pen F Nib 0.5mm Portable Short Travel Ink Pen Writing Office Set (D One Size)

Beaded Pen “Brown Pen with Dog” Black ink, Free Extra Ink Refill