Part 2 of 2 – Solvent-Free Oil Painting Mediums
Solvent-Free Oil Mediums—Clear Options for Real Studios
Choose between gels or pastes—no solvents required.
What Artists Say About Solvent-Free Oil Painting Mediums
Part 2 of 2 of the “Solvent‑Free Oil Painting Mediums” series
Why Look Past Alkyd?
Painters seeking faster drying often turn first to solvent-free alkyd gels. Yet many studios want a completely resin‑free approach that still avoids mineral spirits. Modern product lines now offer purified, polymerised, or gelled drying oils that flow well, level predictably, and release almost no volatile organic compounds (VOCs). This article explains how these non‑alkyd alternatives work, compares leading brands, and outlines best practices so artists can adopt them with confidence.
Regulatory Framework for Non‑Alkyd Media
Trace solvents and VOC reporting
Pure or polymerized drying oils are classified as non-hazardous under the OSHA Globally Harmonized System; their Safety Data Sheets list 0% VOC and no flammable-liquid pictogram (Gamblin Artists Colors, 2023). ISO 14021 treats “free‑of” claims as valid when only background residues remain and no solvent is intentionally added (ISO, 2016). Therefore, a fluid or gelled oil sold as “solvent‑free” should disclose only triglycerides, silica, driers, and trace water.
Bio‑esters and the “green solvent” issue
Plant-derived esters, such as those in Sennelier’s Green for Oil line, dissolve paint films but evaporate slowly and exhibit low toxicity (Sennelier, 2024). While the company markets them as safer substitutes for mineral spirits, they still act as solvents and require ventilation. For clarity, this article labels them “solvent‑reduced,” not truly solvent‑free.
Compare Solvent-Free Oil Painting Mediums
| Product | Type | Body / Consistency | Open Time* | Sheen | Dry-to-Touch* | Best For | Shop |
|---|---|---|---|---|---|---|---|
| Oleogel | Gel | Thixotropic gel; firm, holds brushmarks; adds transparency | Medium | Satin–gloss | Medium | Controlled brushstrokes without slumping; transparent body | Add to Cart |
| Walnut Oil Gel | Gel | Firm thixotropic gel; pale/clear appearance | Long | Satin | Slower | Extended blending, subtle edges, paler mixtures | Add to Cart |
| Epoxide Oil Gel | Gel (oil-based) | Translucent thixotropic gel; smooth, cohesive strings | Medium | Satin–gloss | Medium–fast (accelerated) | Body + transparency with a quicker set; glazing | Add to Cart |
| Pale Drying Oil Gel | Gel | Firm thixotropic gel; amber/clear appearance | Medium | Satin | Fast | Faster drying; resists sinking in | Add to Cart |
| Velázquez Medium | Paste medium | Flowing, “long” paste; finely ground calcite in bodied oil | Medium | Matte–satin | Medium | Stringy/ropey strokes, extended paint, thick yet slightly transparent impastos | Add to Cart |
| Impasto Medium | Paste medium | Calcite-rich paste; stiffer/putty-like; crisp handling | Medium | Matte | Medium | Knife work and fine, crisp impasto; subtle texture with reduced saturation | Add to Cart |
| Impasto Putty | Paste medium | Extra-stiff putty; calcite/barite/bentonite in bodied oil; very crisp | Medium | Matte | Medium | Sculptural, heavy impasto with firm edges; knife or spatula applications | Add to Cart |
*Relative values. Drying and open time vary with pigment, film thickness, and environment. All products listed are solvent-free (no added solvents).
How Manufacturers Create Body Without Solvents
Purified and polymerized oils
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Refined linseed, safflower, and poppy. Modern refining removes mucilage and free fatty acids, thereby lowering yellowing while maintaining viscosity close to that of raw oil (Gamblin Artists Colors, 2023).
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Stand oil. Heating linseed to approximately 280°C in an inert atmosphere polymerizes the chain, producing a honey-thick liquid that levels beautifully and yellows less than raw oil (Art Spectrum, 2022).
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Sun‑thickened linseed. Shallow trays of oil cure under UV and oxygen. The resulting liquid is thixotropic, sets faster than raw oil, and retains a handmade character prized by traditionalists (Natural Pigments, 2024).
Oil‑silica gel technology
Hydrophobically treated fumed silica forms a 3‑D network that traps oil and creates a soft gel. Because the silica remains part of the dry film, no hydrocarbon is required to maintain fluidity (Natural Pigments, 2023). Common studio examples include Oleogel (made from linseed oil) and Walnut Oil Gel.
Reactive plant esters and bio‑solvent blends
Sennelier’s Universal Medium blends vegetable oil derivatives with biodegradable esters, giving open time similar to traditional painting mediums while reducing odor and flammability (Sennelier, 2024). Although these esters are solvents, their boiling points exceed 250 °C, so airborne concentration in normal ventilation remains low.
Solvent-Free Mediums at a Glance
| Medium | Core ingredients (maker / SDS) | Claimed solvent-free language | Key handling use | Source |
|---|---|---|---|---|
| Oleogel (Natural Pigments) | Linseed oil, fumed silica | “Thixotropic medium… no added solvent” | Adds body & transparency; levels but resists drip | naturalpigments.com/oleogel |
| Walnut Oil Gel (Natural Pigments) | Water-washed walnut oil + fumed silica | “Contains no solvents or metal driers” | Clear gel, lower yellowing than linseed | naturalpigments.com/walnut-oil-gel |
| Velázquez Medium (Rublev Colours) | Finely ground calcite in heat-bodied linseed oil | “Paste medium… solvent-free” | Extends paint, creates ropey impastos | naturalpigments.com/velazquez-medium |
| Impasto Putty (Rublev Colours) | Calcite, barite, and bentonite in refined and heat-bodied linseed oil | “No stearates, solvents, resins, or driers” | Knife-ready paste for thick peaks | naturalpigments.com/impasto-putty |
| Impasto Medium (Rublev Colours) | Calcite, barite, and talc in pale linseed oil | “Extend paint without solvents” | Semi-transparent paste for crisp strokes | naturalpigments.com/impasto-medium |
| Walnut Painting Gel (Art Treehouse) | Water-washed walnut oil + colloidal silica | “No solvents, no alkyds, no propylene glycol” | Slick, clear gel for alla prima workflows | arttreehouse.com/walnut-painting-gel |
| Impasto Painting Putty (Art Treehouse) | Walnut oil, calcium carbonate, silica, barite | “No alkyds… no petroleum-based solvents” | Very stiff putty for palette-knife texture | arttreehouse.com/impasto-painting-putty |
| Oleogel (Langridge) | Refined safflower oil, fumed silica, trace castor wax + cobalt/calcium driers | “A solvent-free, soft gel medium” | Thixotropic gel—flows under the brush, sets firm | langridgecolours.com/oleogel |
| Miracle Medium MM0 (Michael Harding) | Isopropyl myristate (IPM) (SDS 0% VOC) | “Vegan – plant-based – solvent-free” | Thin, water-clear fluid for glazing & brush cleaning | michaelharding.co.uk/mm0-miracle-medium |
| Miracle Medium MM1 (Michael Harding) | Linseed stand oil + Isopropyl myristate (IPM) | “Low-viscosity… solvent-free alternative” | Adds gloss & flow, speeds dry slightly | michaelharding.co.uk/mm1-miracle-medium |
| Green for Oil Gel Medium (Sennelier) | Fumed silica, zinc 2-ethylhexanoate, < 2 % dearomatised C10-C13 hydrocarbons | “Spirits replaced by plant esters” (SDS shows minor hydrocarbon) | Soft gel; marketed to eco-studios; ventilate anyway | sennelier-colors.com/green-for-oil-gel |
Data culled from current SDS sheets and manufacturer literature (Art Spectrum, 2022; Natural Pigments, 2023; Sennelier, 2024).
Using Non‑Alkyd, Solvent‑Free Media in Practice
Adjusting viscosity
Stand oil is extremely thick. Mix one part stand oil with two parts refined linseed to create a glazing medium that levels and stays open for many hours. For impasto, incorporate 5‑10 % Oleogel directly into the paint. The silica network stiffens brushmarks yet relaxes under palette‑knife pressure.
Layering and fat‑over‑lean
All solvent‑free oils increase fat content. Begin lean with diluted paint or no medium in the underpainting. Progressively add more gel or polymerised oil in later layers. This approach respects the traditional fat‑over‑lean rule and reduces the risk of wrinkling.
Dry time expectations
Pure oils dry slowly. A thin layer of refined linseed reaches touch‑dry in two to five days at 21 °C and 50 % RH (Gamblin Artists Colors, 2023). Stand oil can double that time. Conversely, Oleogel speeds oxidative cure because silica improves oxygen diffusion, often cutting dry time by one‑third (Natural Pigments, 2023).
Cleaning and safety
Even 100% oil mediums can auto-ignite. Always store used rags in a sealed metal can half‑filled with water (NFPA, 2024). Plant esters in bio-solvent blends can irritate the skin, so wearing gloves is advisable.
Dispelling Persistent Myths
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Myth: Linseed oil is more toxic than OMS. Refined oils lack the inhalation hazards associated with mineral spirits and contain no aromatic hydrocarbons (Gamblin Artists Colors, 2023).
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Myth: Stand oil always yellows. High‑temperature polymerisation reduces conjugated diene formation, so well‑made stand oil yellows less than raw oil in accelerated tests (Art Spectrum, 2022).
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Myth: Gelled oils crack. Elastic-modulus studies indicate that silica-gel mediums align with the deformation range of traditional oil films when used at a volume of 20% or less (Natural Pigments, 2023).
Solvent-Free Is Not Always Alkyd Mediums
Solvent-free does not necessarily mean alkyd. Refined, polymerized, and gelled drying oils provide painters with a quiet studio, predictable handling, and archival performance when used in conjunction with sound layering logic. Read the SDS, ventilate normally, and treat oily waste responsibly. With these practices, artists can enjoy a solvent‑free workflow that supports both creative expression and long‑term health.
Bibliography
ASTM International. ASTM D4236-16: Standard Practice for Labeling Art Materials for Chronic Health Hazards. West Conshohocken, PA, 2016.
Practical labeling standard that obliges U.S. art-material manufacturers to disclose ingredients with chronic health risks; it sets no numeric solvent limits.
https://www.astm.org/d4236-16.html
Art Spectrum. Stand Linseed Oil – Safety Data Sheet. Melbourne, 2022.
SDS for heat-polymerised linseed oil; reports 0 % VOC, high flash-point, and no flammable-liquid pictogram—confirming its solvent-free status.
https://artspectrum.com.au/wp-content/uploads/Stand-Linseed-Oil-SDS.pdf
Art Treehouse. “Impasto Painting Putty.” Product page, accessed 13 July 2025.
Describes a walnut-oil putty loaded with calcite, silica, and barite; the copy emphasises “no alkyds, no petroleum-based solvents.”
https://arttreehouse.com/product/impasto-painting-putty/
———. “Walnut Painting Gel.” Product page, accessed 13 July 2025.
Silica-gel medium made with water-washed walnut oil; claims “no solvents, no alkyds, no propylene glycol” and lists VOC 0 g/L¹.
https://arttreehouse.com/product/walnut-painting-gel/
Borchers GmbH (Milliken). Octa-Soligen® Zinc – Technical Data Sheet. Cologne, 2024.
Explains the drying mechanism of zinc 2-ethylhexanoate in oxidative coatings and typical let-down levels for solvent-free media.
https://borchers.com/products/octa-soligen-zinc/
Federal Trade Commission. “Eco-Friendly and Green Marketing Claims (‘Green Guides’).” Last revised March 2021.
Clarifies when marketers may lawfully use “free-of” language; requires only trace, non-functional amounts of restricted chemicals.
https://consumer.ftc.gov/articles/eco-friendly-and-green-marketing-claims
Gamblin Artists Colors. “Solvent-Free Oil Painting.” Studio Safety page, accessed 12 July 2025.
Summarizes the firm’s alkyd- and oil-based solvent-free products and provides ventilation and rag disposal advice for painters.
https://gamblincolors.com/studio-safety/solvent-free-painting/
———. Safety Data Sheet: Refined Linseed Oil. Rev. 10 Mar 2023.
Confirms 100 % linseed oil, VOC 0 g/L¹, and no GHS hazards—serving as a baseline “pure-oil” reference.
https://gamblincolors.com/wp-content/uploads/2023/03/SDS-Refined-Linseed-2023.pdf
———. Safety Data Sheet: Solvent-Free Gel. Rev. 1 May 2023.
Lists safflower-alkyd, silica, and 1-3 % propylene glycol; no petroleum distillate and 100 % solids.
https://gamblincolors.com/wp-content/uploads/2023/05/SDS-Gamblin-Solvent-Free-Gel-2023.pdf
Green Seal. GS-11: Paints, Coatings, Stains, and Sealers. Washington, DC, 2023.
Third-party ecolabel defining ≤ 5 g/L⁻¹ as “zero-VOC” for architectural coatings—often cited by paint makers.
https://greenseal.org/gs-11
International Organization for Standardization. ISO 14021:2016 — Environmental Labels and Declarations: Self-Declared Environmental Claims (Type II). Geneva, 2016.
Governs marketing phrases such as “solvent-free” and “VOC-free,” requiring them to be truthful and not misleading.
https://www.iso.org/standard/66652.html
Langridge Artist Colours. “Oleogel.” Product page, accessed 13 July 2025.
Introduces a safflower-oil / fumed-silica gel described as “a solvent-free, soft gel medium” for contemporary oil painters.
https://langridgecolours.com/products/oleogel/
M. Graham & Co. Safety Data Sheet: Walnut Alkyd Medium. Issued 27 Jan 2021.
Shows VOC 0 g/L¹ and no flammable-liquid pictogram for a walnut-oil-extended alkyd medium.
https://mgraham.com/wp-content/uploads/2023/04/M.-GRAHAM-OIL-COMBINED-SDS-SHEET-032023.pdf
Michael Harding. “MM0 Miracle Medium.” Product information page, accessed 13 July 2025.
Describes a vegan, plant-ester glazing fluid positioned as a solvent-free alternative to traditional spirit-based thinners.
https://www.michaelharding.co.uk/product/mm0-miracle-medium/
———. “MM1 Universal Thin Miracle Medium.” Product information page, accessed 13 July 2025.
Blend of stand oil and ester solvent; promoted as a low-viscosity, solvent-free flow improver for detail work.
https://www.michaelharding.co.uk/product/mm1-universal-thin-miracle-medium/
National Fire Protection Association. NFPA 30: Flammable and Combustible Liquids Code. Quincy, MA, 2024.
Section 16.7 details safe storage of oily waste to prevent spontaneous combustion in art studios.
https://www.nfpa.org/codes-and-standards/all-codes-and-standards/list-of-codes-and-standards/detail?code=30
Natural Pigments. Oleogel – Safety Data Sheet. Rev. 2023.
Specifies linseed oil and amorphous silica only, VOC 0 g/L¹, confirming solvent-free status.
https://www.naturalpigments.com/oleogel-sds
———. “Oleogel.” Product page, accessed 13 July 2025.
Marketing description emphasising thixotropy and the absence of added solvents.
https://www.naturalpigments.com/oleogel.html
———. “Walnut Oil Gel.” Product page, accessed 13 July 2025.
Highlights solvent- and drier-free walnut-oil gel with a lower tendency to yellow.
https://www.naturalpigments.com/walnut-oil-gel.html
———. “Impasto Medium.” Product page, accessed 13 July 2025.
Mineral-paste medium of calcite, barite, and talc in pale linseed oil; billed as solvent-free extender.
https://www.naturalpigments.com/impasto-medium.html
———. “Velázquez Medium.” Product page, accessed 13 July 2025.
Bodied oil/calcite paste modelled on Velázquez’s reported putty medium; expressly solvent-free.
https://www.naturalpigments.com/velazquez-medium.html
———. “Impasto Putty.” Product page, accessed 13 July 2025.
Very stiff calcite-barite-bentonite paste for knife texture; claims no solvent, resin, or drier.
https://www.naturalpigments.com/impasto-putty.html
———. “Sun-Thickened Linseed Oil.” Product page, accessed 13 July 2025.
Explains UV/oxygen outdoor polymerisation process, faster set times, and solvent-free nature.
https://www.naturalpigments.com/sun-thickened-oil.html
Sennelier. Green for Oil Gel Medium – Safety Data Sheet. Paris, 2024.
Lists fumed silica, zinc drier, and < 2 % dearomatised C10-C13 hydrocarbons; marketed as plant-ester based, but SDS shows minor white-spirit fraction.
https://cdn.dick-blick.com/msds/DBH_SDS_010461004.pdf
———. “Green for Oil – Eco-Friendly Additives for Oil Paint.” Accessed 13 July 2025.
The manufacturer claims traditional spirits have been “replaced by mixtures of fatty acids and plant esters.”
https://www.sennelier-colors.com/en/Green-for-oil-eco-friendly-additives-for-oil-paint_fiche_13400.html
U.S. Environmental Protection Agency. 40 CFR Part 59: National Volatile Organic Compound Emission Standards for Consumer and Commercial Products. Updated 10 Jul 2025.
Sets VOC content caps (50–250 g/L⁻¹) for consumer coatings categories.
https://www.ecfr.gov/current/title-40/chapter-I/subchapter-C/part-59
Winsor & Newton. Safety Data Sheet: Griffin Alkyd Fast-Drying Oil Colour. Rev. 5, 17 Nov 2015.
Discloses 10–30 % hydrotreated light distillate and butanone oxime; demonstrates that Griffin colours are not solvent-free.
https://www.jerrysartarama.com/media/pdfs/winsor-newton/W&N-GRIFFIN-ALKYD-OIL-COLOURS-MSDS-SHEET-2017.pdf
This bibliography consolidates all sources cited from Part 1 (“Solvent-Free Alkyd: A Painter’s Guide to Safer, Fast-Drying Mediums”) and Part 2 (“Solvent-Free Oil Mediums: Beyond Alkyds in the Modern Studio”) of the series, plus additional product pages and SDS documents referenced in the tables.
