If you’ve ever stood in an art supply store, staring at rows of paint tubes with labels like “professional grade” or “artist quality,” you know how easy it is to default to the most expensive option—especially when you’re a painter, muralist, or even a small business owner mixing custom pigments for commissioned work. For years, as someone who’s spent 12 years sourcing and testing pigments for my Painting Pigments supply business, I thought high quality just meant bright colors that lasted a long time. But over hundreds of client conversations, testing batches in my lab, and seeing what works for everything from oil paintings to watercolor murals, I’ve learned there’s a lot more to it than that. Today, I’m breaking down exactly how to tell if a painting pigment is high-quality—no fancy lab degree required—because when you’re relying on pigments that don’t fade, don’t separate mid-use, and don’t compromise your art, you don’t want to guess. Painting Pigments
First, let’s talk about the most obvious, and often most misleading, metric: color intensity. A lot of brands will slap a label on a tube that says “vibrant cadmium red” or “deep ultramarine,” and that color might pop under store lights. But here’s the thing: high-quality pigments don’t just look bright in a 10-centimeter swatch under artificial light—they hold that intensity when thinned, layered, or exposed to natural sunlight over years. A cheap pigment might use a filler to cut costs, so even if the label says “90% pigment loading,” that number is misleading. I once had a client bring me a batch of red paint she’d bought from a big-box art supply chain; when she thinned it with water to add glazes to a landscape painting, the red turned pale pink, like she’d mixed it with half a bottle of white. That’s a filler issue: cheap pigments add calcium carbonate or talc to bulk up the product, so you’re paying for more filler and less actual pigment. High-quality pigments, on the other hand, have a high pigment volume concentration (PVC) of pure pigment—usually 60% or higher for professional-grade tubes. When you thin them, the color stays rich because there’s less filler to dilute it. I test every incoming batch of reds, blues, and yellows by thinning a small amount with distilled water (for water-based pigments) or linseed oil (for oil-based) and letting it dry flat. If it fades to a muted tone after drying, that’s a sign of low-quality filler.
Next up: lightfastness, and this is where the industry’s small print gets really tricky. You’ve probably seen little labels on paint tubes with ratings like “ASTM I” or “ASTM II,” or even “A” or “B” from the Blue Wool Scale. That Blue Wool Scale is the gold standard for lightfastness, right? It rates pigments from 1 (fades extremely easily) to 8 (almost no fading over 100 years of sun exposure). But here’s the catch: a lot of brands will print “Lightfast” on the label, but only test the pure pigment itself—not the full paint. Because when you mix a pigment with a binder (the oil, water, or acrylic that makes it spreadable), that can affect how light-resistant it is. For example, a pigment rated ASTM I as a pure powder might drop to ASTM II when mixed with a cheap acrylic binder that breaks down in sunlight. That’s why as a supplier, I insist on testing every finished paint batch using both pure pigment and mixed paint, exposing samples to simulated UV light for 1,000 hours (the equivalent of about 10 years of outdoor sun exposure). If after that time, the color shift is less than 1 ΔE (a unit of color difference, where anything under 2 is invisible to the human eye), that’s high-quality. I’ve had clients tell me they lost thousands of dollars on commissioned murals that faded in two years because they bought cheap pigments that were only tested as pure powder, not mixed with binders. Lightfastness isn’t a marketing buzzword—it’s a promise that your art will look the same decades from now as it did when you finished it.
Then there’s texture and consistency, which you can tell just by squeezing a small amount of pigment onto a palette. I’ve squeezed so many cheap pigments that feel like wet flour clumps, or runny as skim milk, separating into goop and pigment powder before I even mix it. High-quality pigments have a smooth, buttery texture that stays consistent no matter the brand, because they use well-milled pigment particles and high-quality binders. Milling is a big part of this: when pigment particles are too large, they feel gritty on the canvas, and when they’re too small, they clump together. Professional pigments are milled to a uniform particle size—usually between 0.1 and 1 micrometer for most art pigments. That means no grit when you paint, no streaks when you layer, and no settling at the bottom of the tube (which is another sign of poor quality). A quick test: squeeze a pea-sized amount of pigment onto a palette, drag a palette knife through it, and see if it leaves a smooth line. If there’s gritty residue or the line breaks, that’s a sign of over-milled or poorly mixed pigment. I always tell new painters to test a small batch of pigment before committing to a full tube—because even a brand that’s known for quality can have an off-batch, and you don’t want to waste money.
Another thing that’s not talked about enough is toxicity and purity, which is huge for both artists and anyone using pigments for large-scale projects like murals or sign painting. A lot of cheap pigments use heavy metals like lead, cadmium, or mercury because they’re less expensive than synthetic alternatives. But not only are these bad for your health if you inhale the pigment dust while mixing, they can also react over time—lead white, for example, can darken to a brownish tone when exposed to sulfur in the air. High-quality pigments will have clear safety data sheets (SDS) that list all ingredients, and they’ll be certified by organizations like the ACMI (Art and Creative Materials Institute) for non-toxicity, or for heavy metal limits set by the EPA. I once had a high school art teacher reach out to me because she’d bought a set of acrylic pigments for her students, and half of them had skin irritation after using them. When we tested the batch, it had lead levels three times the legal limit for artist pigments. That’s the difference between a reputable supplier who cares about quality and safety, and a cut-rate brand that only cares about cost. For anyone working with pigments regularly, or using them in spaces with kids or large groups, purity and toxicity aren’t afterthoughts—they’re part of what makes a pigment high-quality.
Wait, and let’s not forget about versatility, which comes down to how well the pigment works with different binders and mediums. A high-quality pigment isn’t one that only works for oil paint—it’s one that mixes well with acrylic, watercolor, or even tempera, without changing color or texture. I’ve had professional painters tell me they’d switch to my pigments because they can use the same powder for a client’s oil portrait, watercolor sketch, and large-scale outdoor mural, which saves them time and money. Cheap pigments often have binders that are specific to one type of medium, so if you try to use them with something else, the pigment separates or the color shifts. For example, a cheap ultramarine blue designed for watercolor might not mix well with oil-based mediums, turning murky and uneven when layered. High-quality pigments are formulated to be versatile, so you don’t have to buy separate pigments for every project. That’s a big plus for small business owners, independent artists, or anyone who doesn’t want to stock 10 different pigment lines for different uses.
Now, I know what some of you are thinking: “This all sounds great, but how do I avoid the brands that lie about their labels or cut corners?” As a supplier, I’d be lying if I said there aren’t brands that fudge their lightfastness ratings or understate filler content. The best way to avoid that is to ask questions, and don’t be afraid to request sample batches. Reputable suppliers (including my Painting Pigments business) will send free small samples to test for color, texture, lightfastness, and compatibility before you place a large order. You can also check independent reviews from other artists, not just the brand’s own website. I’ve had clients come to me after reading a review on an art forum that said a certain brand’s cadmium yellow faded after three years, and they were tired of wasting money on products that didn’t live up to their promises.
At the end of the day, high-quality painting pigment isn’t just about being “better”—it’s about being reliable. It’s about mixing a glaze that doesn’t turn pale, painting a mural that stays bright for decades, not just a few years, and working with a product that’s safe for you and anyone who sees your art. When I started this business 12 years ago, I noticed a gap: a lot of suppliers either sold only bulk raw pigment powders (too technical for most artists) or small retail tubes that were overpriced and full of fillers. So I started formulating my own batches, testing each one in my small lab, and sending samples to painters to test in real projects. That hands-on testing is what makes us different, and it’s what I tell all my clients: the best way to know if a pigment is high-quality is to test it yourself.
DIY Toys If you’re tired of wasting money on pigments that don’t perform, fade too fast, or are unsafe to use, I’d love to chat about your project. Whether you’re a professional painter working on a gallery show, a muralist preparing for a community project, or a small business owner looking for consistent pigments for custom work, we can talk about your needs, send over test samples, and find the right pigment for you.
References
- Gallo, F. (2019). The Artist’s Guide to Pigment Quality and Lightfastness. Chronicle Books.
- International Organization for Standardization (ISO). (2021). ISO 12235:2021 – Paints and varnishes – Determination of lightfastness of paints.
- Art and Creative Materials Institute (ACMI). (2022). Certified Products List – Artist Pigments. ACMI.
- Mayer, R. (2009). The Artist’s Handbook of Materials and Techniques (5th ed.). Vintage Books.
- American Society for Testing and Materials (ASTM). (2020). ASTM D4303-20 – Standard Practice for Running Lightfastness Tests for Artists’ Pigments.
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