Platinum Carbon Sepia Ink
I adore this ink and use it for all my doodlewashes. It’s pigmented instead of dye-based, which makes it very permanent, waterproof and lightfast. The sepia color is wonderful and provides a line that’s lighter than using pure black in sketches. I’ve never once had a problem with clogging in my fountain pens with this ink, but I do use my pens nearly every day, so that might make a difference!