Robert Oster Motor Oil Fountain Pen Ink — 50 mL

Robert Oster Motor Oil is a dark, murky brown with enough black and olive depth to justify its industrial name. It can look nearly black in dense areas, then open into warmer brown where the line thins.

Independent reviews describe dark shading and black sheen in heavily saturated areas, with a smooth, slightly wet writing feel. The sheen is most visible on coated, fountain-pen-friendly paper; ordinary paper will show mainly the dark brown base.

Ink character

• Color: very dark brown with murky olive-black depth
• Shading: medium to high
• Sheen: black in heavy pooling
• Shimmer: none
• Flow: moderately wet
• Water resistance: low
• Best suited to: journaling, sketch notes, everyday writing

Motor Oil is a brown for writers who prefer shadow to warmth: dense, unusual, and particularly handsome next to cream paper and brass desk tools.