Each brand and colour formulation has its own wiriting characteristics. and performance in various brands of pens. One of the advantages of writing with a fountain pen is the array of colours of inks.
Diamine Chocolate Brown - Ink Reviews - The Fountain Pen Network
The Colours of Fountain Pen Ink - Glenn Marcus Pen Views
Ink color changing as I write? : r/fountainpens
Ink Review: Pelikan Edelstein Smoky Quartz - The Well-Appointed Desk
Lamy AL-star Fountain pen blog
Vancouver Pen Club: November 2022
Ink Review: Pelikan Edelstein Smoky Quartz - The Well-Appointed Desk
Sheaffer 1750 Crest Deluxe + Sailor Shikiori Ink - Today's Sunday Writer. : r/fountainpens
Diamine Brown Ink Fountain Pen Ink - Glenn's Page
Diamine Brown Ink Fountain Pen Ink - Glenn's Page
Ink Brands - Glenn's Pens