Colour theory is the study of how colours relate, mix and affect each other, organised on the colour wheel into primary colours (red, yellow, blue), secondary colours (orange, green, violet) and tertiary colours (the six in-between hues such as red-orange and yellow-green). Mastering it lets you mix a wide range of colours deliberately and combine colours that work together. Art by Ancourage teaches colour from first principles at Bishan and Woodlands.
This guide explains the colour wheel, the three properties of every colour, tints, shades and tones, warm versus cool families, and the common colour schemes artists use. It is part of our wider art techniques and fundamentals series and pairs closely with our guides to composition and shading and value.
When we teach colour mixing, we hand students a limited palette — just the three primaries plus white — and ask them to mix every secondary and a few tertiaries before touching a tube of pre-made green or orange. Students who learn to mix this way understand colour far more deeply than those who reach for a ready-made tube, and their paintings hold together because every colour shares the same family.
What Is Colour Theory?
Colour theory is the body of practical guidance, built up from Isaac Newton onward, that describes how colours are organised, how they mix, and how they affect one another when placed together. Its central tool is the colour wheel — a circular arrangement of hues that makes relationships between colours easy to see, such as which sit opposite (and clash or balance) and which sit next to each other (and harmonise).
For painters, colour theory is not abstract. It tells you which two colours to mix to get the green you want, how to dull a colour that looks too garish, and which combinations will make a focal point pop. The vocabulary it provides — hue, value, saturation, complementary, analogous — is the same language used when you analyse and critique an artwork.
What Are the Primary, Secondary and Tertiary Colours?
In the traditional artists' (RYB or pigment) model, the primary colours are red, yellow and blue — they cannot be mixed from any other colours — while secondary colours (orange, green, violet) are each made by mixing two primaries, and tertiary colours are the six hues between them. This three-tier structure is the backbone of the colour wheel.
| Group | Colours | How they are made |
|---|---|---|
| Primary | Red, yellow, blue | Pure pigments — cannot be mixed from other colours |
| Secondary | Orange, green, violet (purple) | Two primaries mixed (red + yellow, yellow + blue, blue + red) |
| Tertiary | Red-orange, yellow-orange, yellow-green, blue-green, blue-violet, red-violet | A primary mixed with a neighbouring secondary |
The twelve hues above — three primary, three secondary, six tertiary — make up the standard twelve-part colour wheel that most art classes use. Note that this RYB model is for mixing pigment; it is different from the RGB and CMYK models below.
What Are the Three Properties of a Colour?
Every colour has three measurable properties: hue (the colour family it belongs to, such as red or blue), value (how light or dark it is), and saturation or intensity (how pure and vivid it is versus dull and greyed). Changing any one of these gives you a new version of the colour without changing the others.
- Hue: the name of the colour — red, orange, yellow, green, and so on. It is the position of the colour on the wheel.
- Value: the lightness or darkness. Value is so important that we cover it in depth in our shading and value guide — a painting with good colour but weak value rarely reads well.
- Saturation (intensity): how pure the colour is. Straight from the tube a colour is highly saturated; mixing in its complementary or a little grey dulls it down.
How Do You Make Tints, Shades and Tones?
You lighten or darken a colour by adding white, black or grey: a tint is a colour mixed with white, a shade is a colour mixed with black, and a tone is a colour mixed with grey. These three moves let you build a whole range of values and intensities from a single hue.
- Tint = colour + white: pink is a tint of red; pale blue is a tint of blue. Tints feel lighter and softer.
- Shade = colour + black: maroon is a shade of red; navy is a shade of blue. Shades feel deeper and heavier. Use black sparingly, as it can deaden a colour.
- Tone = colour + grey: adding grey lowers a colour's saturation, giving the muted, natural colours useful for realistic work; whether it also looks lighter or darker depends on the grey you mix in.
Why Do Warm and Cool Colours Matter?
Warm colours (reds, oranges, yellows) feel energetic and appear to advance toward the viewer, while cool colours (blues, greens, violets) feel calm and appear to recede into the distance. Artists use this temperature contrast to create depth, mood and focus — a warm subject against a cool background naturally steps forward.
Temperature is also relative: a red can be a "cool" red (leaning toward violet) or a "warm" red (leaning toward orange), and skilled painters use these subtle shifts to model form. Managing warm and cool relationships is closely tied to composition, because temperature is one of the strongest ways to guide the eye around a picture.
How Do Complementary and Analogous Colours Work?
Complementary colours sit directly opposite each other on the wheel — red and green, blue and orange, yellow and violet — and create maximum contrast when placed side by side, while analogous colours sit next to each other and create gentle harmony. The same pair behaves in two opposite ways: side by side they intensify each other, but mixed together they neutralise into greys and browns.
According to Tate, complementary pairs contrast more than any other colours and make each other look brighter when set together — which is why a touch of orange makes a blue painting sing. The same mixing principle explains how to dull a colour: rather than reaching for black, mix in a little of its complementary to lower its intensity while keeping it lively.
What Are the Common Colour Schemes?
The five colour schemes artists rely on most are monochromatic, analogous, complementary, split-complementary and triadic, each chosen from the colour wheel to control how harmonious or how high-contrast a picture feels. Choosing a scheme before you start is one of the simplest ways to make a painting feel deliberate rather than accidental.
- Monochromatic: one hue in different tints, shades and tones — calm and unified.
- Analogous: three or four neighbouring hues — naturally harmonious, like a sunset of reds and oranges.
- Complementary: two opposite hues — high energy and contrast.
- Split-complementary: one hue plus the two colours either side of its complement — strong contrast with more balance.
- Triadic: three hues evenly spaced around the wheel — vibrant yet balanced.
How Is RYB Different From RGB and CMYK?
RYB is the subtractive pigment model painters use, RGB is the additive model used for light on screens, and CMYK is the subtractive model used for printing — they use different primary colours because each was designed for a different medium (paint, light or ink). Knowing which model you are working in stops a lot of confusion about why mixing paint behaves differently from mixing light.
On a screen, red, green and blue light add together to make white (additive). With paint or ink, pigments absorb light and mixing them moves toward black or muddy brown (subtractive). For hands-on painting — including watercolour for beginners — the RYB pigment model and a limited palette are what teach you to mix, which is why our classes start there before any talk of screens or printing.
How Does Art by Ancourage Teach Colour?
Art by Ancourage teaches colour through hands-on mixing from a limited palette, so students truly understand how colours behave rather than memorising rules.
This runs through small-group Professional Fine Art Classes and is explored further in our watercolour classes, where transparent layering makes colour relationships especially clear. Book a trial class (from $18) at Bishan or Woodlands.
Frequently Asked Questions
Quick answers about colour theory for art students.
What are the three primary colours in art?
In the traditional artists' (RYB) pigment model, the three primary colours are red, yellow and blue. They are called primary because they cannot be mixed from any other colours. Every other colour on the painter's wheel — the secondaries and tertiaries — is mixed from these three, which is why a limited palette of red, yellow, blue and white can teach almost all of colour mixing.
What is the difference between a tint, a shade and a tone?
A tint is a colour mixed with white, which lightens it (red becomes pink). A shade is a colour mixed with black, which darkens it (red becomes maroon). A tone is a colour mixed with grey, which lowers its intensity and mutes the hue; its value can stay similar or shift lighter or darker depending on the grey used. Together, these three moves let you build a full range of values from any single hue.
What are complementary colours?
Complementary colours sit opposite each other on the colour wheel — the classic pairs are red and green, blue and orange, and yellow and violet. Placed side by side they create maximum contrast and make each other look brighter. Mixed together, however, they neutralise into greys and browns, which is a useful way to dull a colour without using black.
What is the difference between warm and cool colours?
Warm colours are reds, oranges and yellows; they feel energetic and appear to advance toward the viewer. Cool colours are blues, greens and violets; they feel calm and appear to recede. Artists use this contrast to create depth and direct attention, placing a warm subject against a cool background so it naturally steps forward in the picture.
How can I learn colour mixing as a beginner?
Start with a limited palette — just red, yellow, blue and white — and mix every secondary and a few tertiary colours yourself before using ready-made tubes. This builds real understanding of how pigments behave and keeps a painting unified, because every colour shares the same source. Our beginner and watercolour classes at Art by Ancourage are built around exactly this hands-on approach.