Orange: The uniquely warm color
Orange alone out of all the colors on the palette is always warm. There are cool reds and cool yellows, but never a cool orange. Burnt Sienna is just a darkened orange, and in this form it is most useful to the artist. This list is organized with a separate page for browns for convenience but it should be understood that many browns are just the dark form of orange. Orange can be useful in small amounts when mixing salmony flesh tones. In landscape it is unavoidable for finding the subtle colors in evening skies, or desert rocks and the trunks of certain Australian trees. Understated and always full of warmth this is a friendly color.

Cadmium Orange PO 20   ASTM  l
Chemical type and description
Inorganic synthetic Cadmium. Co-precipitated Cadmium Sulfide with Cadmium Selenide. Redder shades have a higher portion of Selenium. Slow drying. Makes a hard but fairly flexible oil paint. Introduced in 1846 but was rare for many tears due to the scarcity of the metal. Fades in the presence of moisture. Discolored by lead pigments unless well protected in oil. Chemically Pure grades are available, but it is common to find up to 15% Barium Sulfate. CP. costs more but has a stronger color and is recommended. Also comes in lithopone and vermilion forms although rarely and these should be avoided. Do not use for any drawing media under any circumstances.
Cadmium considered toxic. Do not ingest or breath dust.
Media suitability
Linseed oil,  Alkyd, Acrylic, Watercolor, Gouache, Tempera, Encaustic, Fresco

Perinone Orange PO 43   ASTM  l
Chemical type and description
Organic synthetic Anthraquinone. Average drying. Makes a hard but fairly flexible oil paint. A strong clean reddish orange vat pigment with excellent light fastness. The perfect alternative to Cadmium Orange when more transparency is required or to use in dry media such as pastels.
Not considered toxic. Do not breath dust.
Media suitability
Linseed oil,  Alkyd, Acrylic, Watercolor, Gouache, Tempera, Encaustic, Fresco, Pastel, Chalks.

Other oranges Interesting alternatives
Quinacridone Gold (PO 48) suitable for all media and considered non-toxic. Can exhibit problems during dispersion. Lacks brightness in tints but excellent light fastness.

Quinacridone Burnt Orange (PO 206) Suitable for all media and considered non-toxic. A very beautiful dark reddish orange not dissimilar to Burnt Sienna. Excellent light fastness. Can exhibit problems during dispersion.

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