Phthalo Blue — Stone Watercolor Paint (Liquid & Pan)
Phthalo Blue is the cool, high‑chroma blue in our Stone watercolor line. This beautifully concentrated hue brings clarity, brightness, and a lively cool energy to watercolor work. As the cool half of our balanced blue pair, Phthalo Blue mixes with Ultramarine Blue to create a clear, vibrant True Blue—a foundational warm–cool exercise for early‑grade painting and color exploration.
Ideal for early‑grade watercolor work, seasonal color stories, and lessons that explore warm–cool relationships, Phthalo Blue offers a crisp, luminous character that supports expressive transitions and strong primary mixes.
Produced in the USA using high‑quality pigments and a clean, reliable liquid base, Stone Watercolor Paint is designed specifically for Waldorf watercolor painting. The formula is extremely concentrated, allowing teachers and students to adjust the strength of the color with simple dilution. For general painting, we recommend mixing 10 parts water to 1 part paint. For veil painting, use more water and allow each layer to dry between washes. For richer, more saturated color, simply reduce the amount of water.
Phthalo Blue offers smooth transparency, excellent flow, and a vivid cool tone across all watercolor techniques used in Waldorf classrooms. Its clarity supports crisp greens, bright purples, and strong primary mixes while remaining versatile enough for structured main lesson painting.
Porcelain Pan Option — Stackable Dish
Stone Phthalo Blue is also available as a super‑concentrated artist pan poured into a stackable porcelain dish, pressed for long‑lasting use and consistent daily performance. The porcelain pan provides dense, ready‑to‑use color that activates quickly with water, making it ideal for classroom painting, travel kits, and main‑lesson illustration work.
Pan Phthalo Blue maintains the same luminous clarity and cool energy as the liquid version, offering strong mixes, smooth transparency, and dependable flow. Teachers can adjust intensity simply by varying water on the brush, allowing the pan to serve both veil‑style washes and richly saturated color stories. The stackable porcelain dish keeps the color stable, easy to access, and neatly organized for daily classroom use or compact storage. The 1 oz bottle is perfectly sized for refilling your stackable porcelain pan, allowing teachers to refresh the color as needed without replacing the dish.
Color Mixing with Phthalo Blue
- Phthalo Blue + Ultramarine Blue — Creates a clear, vibrant True Blue.
- Phthalo Blue + Prussian Blue — Creates deep cool blues and strong blue‑green shadow tones.
- Phthalo Blue + Lemon Yellow — Produces vivid, high‑chroma greens and clear cool turquoise tones.
- Phthalo Blue + Golden Yellow — Creates bright greens and lively yellow‑green transitions.
- Phthalo Blue + Vermillion — Produces vivid purples and strong cool violets with high clarity.
- Phthalo Blue + Carmine Red — Creates bright, high‑chroma purples and clear cool violets.
- Phthalo Blue + Red Rose — Produces clean, bright violets and cool purples.
- Phthalo Blue + True Red — Creates vivid purples and crisp cool violet tones.
- Phthalo Blue + Viridian Green — Deepens greens into strong blue‑green tones.
- Phthalo Blue + Black Gouache — Creates deep navy blues and dramatic cool shadow tones.
- Phthalo Blue + White Gouache — Soft sky blues and bright turquoise tints (upper‑grade use).
Non‑Toxic -Conforms to ASTM D‑4236.
Available Sizes
Phthalo Blue Porcelain Pan – 1 oz (28.4 ml) SPBpan – $14.50
Phthalo Blue — 1 oz (28.4 ml) SPB1 — $9.95
Phthalo Blue — 4 oz (113.6 ml) SPB4 — $27.95
Phthalo Blue — 8 oz (227.3 ml) SPB8 — $45.95
