How to Mix Prussian Blue in Watercolor

A very dark, cool green-shade blue. Rich, staining, glass-like in oil. This guide gives you the pigment ratios that land on #0F3446 in watercolor, using the same solver that powers the Chromilla mixer.

Target

Prussian Blue

#0F3446

Mixed result

99% match

From these pigments

#0C3346

Pigment recipe

Checked August 2026

Ratios calibrated for watercolor. Start with the dominant pigment, add the modifiers in the order below, and adjust in 5% steps to your target swatch.

1. Phthalo Blue
PB15
89%
2. Yellow Ochre
PY43
11%

What colors make Prussian Blue?

Phthalo Blue and Yellow Ochre, in roughly a 89:11 ratio.

How to make Prussian Blue in watercolor

Start with Phthalo Blue at about 89% as your watercolor base, then work in Yellow Ochre in the order above. Adjust in 5% steps until the swatch reads #0F3446.

Why mix Prussian Blue instead of buying it

Mixing Prussian Blue yourself lets you approximate an expensive or hard to find tube from pigments you already own, match Prussian Blue across paint brands whose factory tubes differ, and rebuild the exact color when you run out mid painting. The recipe above is the working starting point.

Common mistakes

That pigment is a very strong tinter, add it a touch at a time or it will swallow the mix.

Get this recipe for your paint brand

Open the live mixer with Prussian Blue + watercolor pre-loaded and calibrate to your tubes.

Open in mixer

Related mixing guides

Pigment mixing is subtractive, so small ratio changes matter. The mixer refines this recipe to your brand and updates on the fly.