The colour wheel is the foundation of great colouring. Understanding the three main colour groups — primary, secondary, and tertiary colours — is one of the simplest and most rewarding ways to make more confident and deliberate choices every time you colour.
Many colourists naturally reach for the pencils that feel right in the moment. While instinct is a valuable guide, knowing how primary, secondary, and tertiary colours relate to one another provides a reliable framework that helps every colouring page feel more balanced and intentional.
In this guide, we’ll explain the fundamentals of each colour group and show you how to use them together to add depth, harmony, and personality to your colouring pages.
What Are Primary Colours?
Primary colours are the three foundational colours from which all other colours on the traditional colour wheel are created. They are the starting point for every colour decision and cannot be produced by mixing other colours together.
Because they cannot be created from other colours, primary colours form the backbone of colour theory. Understanding them immediately helps colourists understand how the rest of the colour wheel works.
On a colouring page, primary colours create bold, energetic combinations when used together. Alternatively, allowing one primary colour to dominate a palette gives the finished page a strong identity while other colours provide support.
Although they are often introduced to beginners, primary colours remain essential for experienced colourists and illustrators because of their clarity, versatility, and visual impact. The strong geometric architecture of London scenes is an ideal canvas for exploring how each primary colour performs on its own.
What Are Secondary Colours?
Secondary colours are created by mixing equal parts of two primary colours. They naturally follow the primary colours on the colour wheel and provide the next level of colour variety.
Because secondary colours sit between the primaries, they inherit characteristics from both parent colours. This makes them incredibly versatile and useful for building balanced, harmonious palettes.
Secondary colours also play an important role in complementary colour schemes. Each secondary colour sits opposite a primary colour on the wheel, creating bold, high-contrast combinations that bring energy and focus to a colouring page.
For many colourists, secondary colours are among the most enjoyable to experiment with because their relationships to the primary colours are logical and easy to understand. The varied architecture and natural landscapes in the England collection lend themselves beautifully to secondary colour palettes from earthy greens and oranges to through to rich purples.
What Are Tertiary Colours?
Tertiary colours are created by mixing a primary colour with one of the secondary colours next to it on the colour wheel. These six colours fill the spaces between the primary and secondary colours, creating a richer and more complete spectrum.
This is where colour theory begins to feel especially rewarding. Tertiary colours introduce subtle variations that make it much easier to create palettes with warmth, coolness, softness, and depth.
They are particularly useful in analogous colour schemes because their gradual transitions allow colours to blend naturally rather than creating sharp contrasts.
Despite their name, tertiary colours are not difficult to understand. They are simply the "in-between" colours that many people already choose instinctively. Learning their names simply makes those choices more intentional.
How Primary, Secondary, and Tertiary Colours Work Together on the Page
The real value of understanding the three colour groups comes from seeing how they relate to one another.
Primary and secondary colours naturally create bold, energetic combinations. Introducing one or two tertiary colours softens those contrasts, adding subtle transitions that give a finished colouring page greater richness and sophistication.
Think of the three groups as working together:
- Primary colours provide the energy.
- Secondary colours add balance.
- Tertiary colours introduce nuance and depth.
Together they create palettes that feel cohesive rather than accidental.
Using Primary Colours as Your Anchor
A simple way to build confidence is to choose one primary colour as the dominant colour before introducing anything else.
Giving your palette a clear anchor makes every subsequent colour decision easier because every other colour relates back to that foundation.
This doesn't limit creativity. Instead, it creates a sense of cohesion that allows the finished page to feel balanced and intentional.
Layering in Secondary Colours for Balance
Once a primary colour has been established, introducing its neighbouring secondary colour is an easy way to expand the palette while maintaining harmony.
Secondary colours work best in a supporting role, filling medium-sized areas and details that add interest without competing with the primary colour.
Because the relationship between primary and secondary colours is so logical, this technique works equally well for beginners and experienced colourists.
Adding Depth With Tertiary Colours
Introducing one or two tertiary colours is one of the easiest ways to make a colouring page feel richer and more refined.
Choosing tertiary colours that naturally bridge the primary and secondary colours already on the page creates smooth transitions and a greater sense of depth.
This is where a wide range of colouring pens and pencils becomes especially valuable, allowing subtle tonal variations that elevate the overall result.
Putting Colour Theory Into Practice With Your Colouring Books
Colour theory is most useful when it becomes a practical tool rather than simply something to remember.
An easy starting point is to choose one primary colour you love, identify its neighbouring secondary colour, then add the tertiary colour between them. This simple three-colour palette creates enough variation to produce a beautifully cohesive colouring page.
Colouring books provide an ideal environment to experiment because every page offers a fresh opportunity to practise without pressure. Learning colour theory while colouring can also make the process feel more mindful and relaxing.
Try a Primary Colour Palette First
One of the easiest ways to begin is to limit yourself to the three primary colours.
Their natural contrast creates bold, eye-catching pages that are surprisingly difficult to get wrong. Even choosing just two primary colours can produce striking results, particularly on detailed illustrations.
Planning which primary colour will dominate the largest sections before you begin is one of the most valuable habits you can develop.
Expand Into Secondary and Tertiary Colours as Confidence Grows
As your confidence increases, gradually introduce secondary and tertiary colours into your palettes.
Completing similar pages using different combinations is an excellent way to understand how each colour group changes the overall mood of the finished artwork.
Experimenting regularly helps develop an instinctive understanding of colour relationships that becomes second nature over time.
Getting the Most From Your Colour Palette With the Right Tools
Understanding colour theory becomes much easier when you have a quality set of colouring tools.
A good collection of colouring pens and pencils should include vibrant primary colours, rich secondary colours, and a wide selection of tertiary shades. Having access to subtle tonal variations makes building harmonious palettes far easier.
High-quality pencils also allow better layering and blending, helping tertiary colours create the depth and smooth transitions they are designed to provide.
Start Exploring Primary, Secondary, and Tertiary Colours With Colour Your Streets
Understanding the three colour groups is one of the most empowering skills a colourist can develop. It transforms colour selection from guesswork into a clear, reliable process that works across every colouring page.
Colour Your Streets colouring books are designed for people who enjoy the creative journey as much as the finished artwork. Their detailed cityscapes, landmarks, and architectural illustrations provide the perfect opportunity to experiment with bold primary palettes, balanced secondary combinations, and beautifully nuanced tertiary schemes.
Browse the full collection, choose a design that inspires you, and start putting your new colour knowledge into practice today.
Frequently Asked Questions
What is the difference between primary, secondary, and tertiary colours?
Primary colours are the three foundational colours that cannot be created by mixing other colours. Secondary colours are made by combining two primary colours, while tertiary colours are created by mixing a primary colour with a neighbouring secondary colour. Together, they form the complete colour wheel and provide the foundation for building harmonious colour palettes.
How do I use primary, secondary, and tertiary colours in a colouring book?
A simple approach is to choose one primary colour as the dominant colour, introduce its neighbouring secondary colour for balance, then add one or two tertiary colours to create smooth transitions and depth. This creates a cohesive palette without becoming overwhelming.
What pens and pencils are best for working with tertiary colours?
Pencil and pen sets with a wide tonal range are ideal because they offer multiple shades within each colour family. Good blendability also helps create the subtle transitions that make tertiary colours so effective, allowing you to build richer and more sophisticated colouring pages.