Robert Oster bottle ink, Sinner's Heart, 50ml

Robert Oster Signature Ink – Sinner's Heart

Sinner's Heart is a colour that speaks with quiet intensity. Softly shaded yet emotionally charged, it moves between warm rose tones and dusky crimson, revealing gentle depth as it dries. It is an ink for reflection, expression and the moments when writing becomes a way to slow down and feel.

Crafted in South Australia, Sinner's Heart offers the smooth flow and elegant shading that define Robert Oster’s work. Balanced, expressive and beautifully layered, it brings a sense of warmth and humanity to every page, whether used for journaling, letters or creative exploration.

A drink for your pen.

The Remarkable Robert Oster

Robert Oster is a South Australian colour creator whose inks reflect passion, artistry and a deep connection to the Australian landscape. His colours are known worldwide for their expressive shading, reliability and distinctive character.

Every bottle of Robert Oster Signature Ink is handmade in Australia and presented in a recyclable 50 ml PET bottle, produced in Australia’s first carbon neutral plastics plant. Non-toxic and environmentally considerate, these inks are created with care for both writers and the world they write about.