Rohrer & Klingner SketchINK - Thea (Grey-brown)

Rohrer & Klingner SketchINK Thea is grey, with brown undertones - a fountain pen ink that's completely waterproof thanks to being a pigment-based ink.

About the sketchINK Line – Waterproof Pigment Fountain Pen Inks

Rohrer & Klingner’s sketchINK line sits in a category of its own: true pigment-based, waterproof inks designed for artists, sketchers, and anyone who needs their writing to stay put. Once dry, they bond to the paper with impressive permanence—resistant to water, light, and smudging—while still remaining surprisingly usable in everyday fountain pens, with reliable flow, controlled behavior, and a slightly drier, fast-drying feel typical of serious document inks but without the usual fussiness.

Each color is tuned for creative work, ranging from muted and atmospheric to more striking tones, all drying to a soft, matte finish with minimal shading and no sheen—prioritizing clarity, permanence, and versatility above all else.

Where sketchINK shines:

• Waterproof writing and artwork that can handle washes or highlighting
• Journaling or field notes that need to survive the elements
• Illustration work with clean lines and predictable behavior

A quick note on care:

Like all pigment inks, sketchINK rewards good pen hygiene. Regular cleaning (especially if the pen sits unused) will keep things flowing smoothly. Use it in pens you’re comfortable maintaining, and it will return the favor with rock-solid performance.

If you’ve been looking for a truly permanent fountain pen ink that still feels at home in a daily writer, sketchINK is one of the best-balanced options out there.