How to Mix Ultramarine Blue in Oil

A deep violet-leaning blue. Warm, granulating, and endlessly useful. This guide gives you the pigment ratios that land on #2A3A8C in oil, using the same solver that powers the Chromilla mixer.

Target

Ultramarine Blue

#2A3A8C

Mixed result

96% match

From these pigments

#273783

Pigment recipe

Checked August 2026

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

1. Ultramarine Blue
PB29
69%
2. Viridian Green
PG18
31%

What colors make Ultramarine Blue?

Ultramarine Blue and Viridian Green, in roughly a 69:31 ratio.

How to make Ultramarine Blue in oil

Start with Ultramarine Blue at about 69% as your oil base, then work in Viridian Green in the order above. Adjust in 5% steps until the swatch reads #2A3A8C.

Why mix Ultramarine Blue instead of buying it

Mixing Ultramarine Blue yourself lets you approximate an expensive or hard to find tube from pigments you already own, match Ultramarine 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

Overshooting on Ultramarine Blue is the usual failure, add it in 5% steps and compare against the target between each pass.

Get this recipe for your paint brand

Open the live mixer with Ultramarine Blue + oil 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.