Mont Marte Dimension Acrylic Premium Cobalt Blue 75ml

Mont Marte Dimension Acrylic Premium

Cobalt Blue 75ml

The classic studio blue: balanced, mid-spectrum, and the natural colour of a clear sky.

Cobalt Blue is one of the most historically important pigments in fine art, used by European painters from the early nineteenth century for its uniquely clean, balanced, mid-spectrum blue tone. In the Dimension Acrylic Premium range, it is based on PB28 (Cobalt Aluminate Blue), delivering the characteristic warm-to-neutral mid-blue that has made Cobalt Blue irreplaceable in every serious painting tradition. It sits between Ultramarine Blue (warm, deep) and Phthalo Blue (cool, powerful), occupying a balanced middle position that makes it naturally suited to clear sky passages, clean blue mixing, and sky-keyed still life work. In the ultra-thick heavy body formula, it holds knife marks and impasto texture without slumping. Dries to a gloss finish with a Blue Wool Level 7+ lightfast rating. Available in 75ml tubes and 250ml pots.

Pigment

PB28 (Cobalt Aluminate Blue)

Opacity

Semi-Opaque

Finish

Gloss (when dry)

Drying

20-30 min

1-2 hrs for thick impasto areas

★ Art Shed Staff Tip

Cobalt Blue is the best single blue for painting clear sky. Its naturally balanced tone means less mixing work to arrive at convincing sky blue. A small addition of Titanium White gives the exact quality of a cloudless mid-morning sky. For the most accurate clear sky passages, shift it gently toward Cyan Blue at the horizon.

Perfect For

Clear sky passages in landscape paintingClassic studio palette as the primary mixing blueStill life and interior passages in natural lightPortrait backgrounds in cool natural daylightMixing clean mid-blues without dominant biasTraditional Western painting palette work

What Makes This Colour Essential

●

Consistency

Ultra-Thick Heavy Body

Cobalt Blue delivers the full ultra-thick Dimension Acrylic Premium formula. Knife ridges, impasto peaks, and brushstroke marks all hold without slumping.

★

Hue

Balanced Classic Mid-Blue

PB28 Cobalt Aluminate Blue delivers the historic Cobalt Blue tone: balanced, clean, and neither as warm as Ultramarine nor as cool as Phthalo Blue. The most natural-looking blue in the range.

✓

Purity

Clean Mixing Without Bias

Cobalt Blue's balanced mid-spectrum position means it mixes clean results in both purple and green directions without the strong dominance of Phthalo Blue or the warm bias of Ultramarine.

●

Lightfastness

Blue Wool Level 7+ / ASTM I

Rated at Blue Wool Level 7 or above (equivalent to ASTM I), Dimension Acrylic Premium Cobalt Blue is formulated to remain unchanged for more than 100 years under museum-quality lighting conditions. Purpose-built for archival and professional work.

Mixing with Cobalt Blue

Cobalt Blue's balanced position in the blue spectrum makes it the most natural-looking blue for sky and clean mixing across the blue colour family.

Combine this colour with...

Titanium White → the full arc of clear sky from deep mid-blue to pale horizon light

Ultramarine Blue → deeper, warmer blue for stormy sky and atmospheric depth

Cyan Blue → brighter tropical blue for clear sea passages and vivid colour work

Burnt Sienna → cool dark neutral for shadow passages in cool-lit subjects

Paynes Grey → deep atmospheric blue-grey for overcast sky and cool shadow passages

About Mont Marte Dimension Acrylic Premium

Founded in Australia in 2002, Mont Marte creates high-quality fine art materials for students, hobbyists, and professional artists worldwide. Dimension Acrylic Premium is their flagship heavy body range: an ultra-thick, high-viscosity acrylic formulated for impasto work, palette knife painting, and any technique that demands a paint that holds its shape. With a Blue Wool Level 7+ lightfast rating (equivalent to ASTM I), the 48-colour range is built for serious, permanent work. Available in 75ml tubes and 250ml pots.

Is PB28 Cobalt Blue the same as the historic mineral Cobalt Blue?

Yes. PB28 Cobalt Aluminate Blue is the same inorganic pigment used historically, synthesised from cobalt and aluminium oxides. It shares the same characteristic warm-neutral mid-blue tone as historic Cobalt Blue and is among the most lightfast blue pigments available.

Can I use Dimension Acrylic Cobalt Blue with a palette knife?

Yes. Palette knife application is one of the primary uses for Dimension Acrylic Premium. The ultra-thick formula sits firm on the knife, deposits a clean hard-edged layer on the surface, and holds the shape of each mark as it dries without slumping. Apply straight from the tube for maximum texture and sharp ridges.

Why do painters often keep Cobalt Blue alongside both Ultramarine and Phthalo Blue?

The three blues occupy different positions in the spectrum and each has strengths the others lack. Ultramarine Blue is best for warm darks and purples. Phthalo Blue is best for clean greens and intense deep blues. Cobalt Blue is best for clear sky passages and balanced general blue mixing.

How long does Dimension Acrylic Cobalt Blue take to dry?

Thin applications dry in 20-30 minutes. Heavy impasto builds applied with a palette knife can take 1-2 hours to dry fully. Drying time extends in cold or humid conditions. Do not apply a second thick layer over the first until the lower layer has dried completely to the touch.

What surfaces can I use Dimension Acrylic Cobalt Blue on?

Canvas, board, wood, air-dry clay, plaster, cardboard, paper, leather, and most rigid plastics. For best adhesion on non-porous or slick surfaces, apply a coat of gesso or acrylic primer first. Dimension Acrylic Premium is compatible with all Mont Marte acrylic mediums, gels, and impasto pastes.

Art Shed Online is an authorised Australian stockist of Mont Marte products. All Mont Marte Dimension Acrylic products are sourced through official distribution channels. We ship Australia-wide.

Available at Art Shed Online, Australia's specialist art supply store. Questions? Contact us at customerservice@artshedonline.com.au.

(PMDA0022)

SKU	PMDA0022
Barcode #	9328577016097
Brand	Mont Marte
Shipping Weight	0.1080kg
Shipping Width	0.060m
Shipping Height	0.140m
Shipping Length	0.030m