One fish, two fish. Red fish, blue fish.

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Or, colour theory for absolute beginners.

My watercolour palette with all the colours!

I was writing what I thought was the second post of my Painting for Absolute Beginners series (you can check out the first post, How to Paint for Absolute Beginners Part 1, here) when I digressed into colour theory, and I realized – this really deserves its own post. So, may I present to you Painting for Absolute Beginners – Part 2. Colour Theory.

To begin with, regardless of which type of paint you choose to paint with, the “rules” of colour mixing are pretty universal. Whether you’re working with watercolour or acrylic or oil – red plus yellow generally makes some sort of orange. And blue plus red makes some sort of purple. There are just a few finer details you might want to consider and that’s what I’m going to discuss here.

Coloured markers
I love to surround myself with colour in my art room 🌈

Colour theory – so boring right? Wrong! Unless you’re just planning on throwing some paint, any old paint, at a canvas – this is the stuff that all painting is made of. Realists and abstract expressionists can finally find common ground here. Colour is everything (well, design, technical ability, narrative quality are good too – but for today’s post – let’s agree that colour is everything). Colour theory is very intuitive, and heavily studied, but there’s a little information that can help you out if you are starting from scratch.

Side note: For any scientists (mainly physicists) out there – this is strictly a bit of artist’s colour theory, ,and a little bit of advice from what works well for me. We’re certainly not talking about how your eyes perceive different wavelengths of light and the physics of optics. That was way too out there in Grade 12 and we’re not going back there now. Just had to get that out there…

Colour chart
High school watercolour colour chart.

Traditional colour theory: Red + Blue = ?

Traditional colour theory dates to around the 18th century when there was a push to kind of formalize the painting process and the canon of art instruction. A good first step in this colour theory is that there are three primary pigment colours – red, yellow, and blue. These colours are special because they can’t be mixed from any other colours.

Red yellow and blue
The primary colours: Red, yellow, and blue.

In theory, the primary colours can’t be mixed from any other colours. If you take even one physics course that covers the science of optics, your mind will be blown because that’s not technically how it works in the science world, but it IS essentially how it works on your paint palette. When you mix two primary colours together, you get… a secondary colour. There are three basic secondary colours made from the three possible pairs above. These are orange (red + yellow), green (yellow + blue), and purple (blue + red):

Secondary colours
The secondary colours: Orange, green, and purple.

When you mix two primary colours together, the resulting secondary colour lacks a little… oomph. In general these mixed colours are a little less bright, a little less intense – they are less colourful. Sometimes you will have to adjust for this in your mixtures to get just the right amount of colour and tone and hue. In fact, these less colourful mixes make sense as they’re one step closer to neutral grey which we will discuss later.

All together now.

You will often see colours arranged in a colour wheel. Here are the primary colours, and the shared secondary colours appear between them.

Colour wheel with primary colours.
Colour wheel with primary and secondary colours.

When paint-makers make paint, they usually try to find a natural or “pure” source for a pigment, versus relying on a mixture. As we discussed, mixtures tend to be a little less brilliant, a little more muddy. So if there is a pure or primary pigment they will tend to pick that for their paint. Some pigments are naturally occurring – like a lot of the earth tones. The pigment in raw umber is natural raw umber. Alizarin lake contains naturally- occurring quinacridone pigment. Ultramarine blue was very expensive because it originally used ground lapis lazuli powder mined in Afghanistan. Today, synthetic ultramarine pigment is used which costs a lot less. Many synthetic pigments are used in modern paint which is often more economical and also safer in some cases (historical colours see to have an abundance of lead, cadmium, and other toxins and carcinogens). For some colours, like green, there are very few pigments that are found naturally. In these cases, paint-makers will turn to mixtures or chemically-derived compounds.

I want to point out something about colour permanence. When you shop for paint colours, you may notice that, in addition to other info, the tubes may be labelled with the word “permanence” or “lightfastness”. Lightfastness is a property of colourants like paint. It describes how resistant a specific colour (pigment) is to fading when exposed to light. You may have noticed that old paintings look light and faded. This is because exposure to sunlight breaks down the chemical bonds in pigments. You can see this in an old watercolour chart (above) that’s been hanging on my bulletin board by the window since 2015. The burnt sienna isn’t looking too great these days but the ultramarine blue is holding on nicely. Lightfastness doesn’t necessarily have to do with paint quality. There are some colours that contain volatile pigments. In general you want paints with a lightfastness of ASTM I. Oil paints tend to be more lightfast than watercolour – the oil binder encapsulates the pigment better and has a bit of a protective quality. Just wanted to point that out. 😉

All the primary and secondary colours…

You’re hot then you’re cold: Warm versus cool colours.

Unfortunately it’s not as simple as looking at something orange, and mixing any old yellow plus any old red to paint it. Colours do in fact have a “temperature” – you may have heard of colours being described as warm or cool before. Think of a snowy, cold painting – probably lots of ultramarine blue in the shadows cast on the snow. Or a warm sunset painting – probably lots of reds, oranges, and yellows in the tropical sky. Part of this is psychological – how a colour or colour scheme makes you feel. A painting of a crackling orange camp fire will probably look warm, while a painting of a stormy, grey sea will probably appear cool. For the same colour, a warmer hue will tend towards being more red, while the cooler hue will tend towards more blue.

When you’re mixing colours, this can be an issue. There are cool yellows (think lemons) and warm blues (think turquoise beaches). If you are looking at an object, you need to determine if it is warm or cool or somewhere in between and mix colours accordingly. When you mix a warm colour with a cool colour and vice versa, that tends to produce a muddy mix. It’s best to stay within like “temperatures” when colour mixing. Here are some examples of warm AND cool primary colours:

Examples of warm and cool primary colours. Warm colours are painted along the top row, corresponding cool colours are painted along the bottom. Part of it is psychological perception, part of it is the hue itself. This is definitely not an exact science.

This idea of warm and cool colours can also be illustrated with phone filters:

Colours with “Nashville” warm colour filter applied. Note the white paper background is changed to a warm, reddish white and the warm elements of the colours are more prominent – you pick up more red. This is an example of how you would perceive a warm palette.
Cool colour palette

Colours with Clarendon “cool” filter added. Note that the paper background has a blue tint. The colours are more blue, especially the purple. This is an example of how we would perceive a cool palette.

You… Complete me… Complementary colours.

Colours that are located directly across from each other in the colour wheel are called complementary colours. These are special pairs of colours that, when placed directly next to each other, create the strongest visual contrast. For any horoscope buffs out there, it’s like astrological signs – opposites attract! The shadow cast by an object often contains some of its complementary colour.

In the colour wheel, colours directly across from each other, like orange and blue, are called complementary.
Complementary colour pairs. Note that in each pair there is a primary colour and a secondary colour.

More examples:

Circa Grade 10. My version of Lawren Harris’s Miner’s Houses (I absolutely love the original painting). This was done for art history class – recreating a historical work of art as a means to study that artist’s methods. Note the blue-orange complementary colour scheme. It makes the cold landscape warm and inviting and is incredibly appealing.
Another example of a complementary colour scheme. I often gravitate towards a variation of blue-orange. There is just something so appealing about it to me.
Red-green complementary colour scheme. Birdhouse art by my sister, circa 2014 when she was in her “Painted decorative wooden birdhouse” phase.
Purple-yellow complementary colour scheme.

Not so boring neutrals

Neutral grey is created by mixing complementary colours together: Yellow plus purple, red plus green, blue plus orange.

When you mix two complementary colours together, you get what is called neutral grey. This is an excellent way to mix shadows. I know people tend to think you can just use black in place of a cast shadow, but strictly-speaking that’s not necessarily true. The impressionists really celebrated the rainbow of colours present in all levels of light in their paintings. Shadows contain all sorts of colours and neutral grey in varying mixes is a great place to start.

Paint it black!

No don’t. Everyone should use black sparingly, but you may need it from time-to-time. On the opposite end, watercolourists will use the white of their paper, but acrylic and oil painters will arm themselves with their favourite white, and probably use a lot of it! As I mentioned, there is a tendency to darken colours with black, but that’s not always the best way for representational painting. You can mix colours with neutral grey to darken them. Whenever you mix colours, you may shift the hue – you may unexpectedly make the colour more warm or more cool which may require subsequent mixing and adjustments. For example, yellow plus black can result in a greenish-blue tint because of the interactions between the different pigments and how your eyes perceive them. In colour theory, a tint is a mixture with white, and a shade is a mixture with black as illustrated below:

Paintings with an example of a monochromatic tint colour scheme. Browns and blacks with varying degrees of white.

Putting it all together – A basic painter’s palette for absolute beginners 😉

For a basic painter’s palette, I would recommend the following colours (and this list is tried and true, going way back to my very first watercolour palette – it still works well!)

  • Alizarin crimson
  • Cadmium red
  • Cadmium yellow
  • Ultramarine blue
  • Burnt sienna
  • Burnt umber
  • Raw sienna
  • Payne’s grey**

**I’ve added Payne’s grey as a staple colour over the years because it is just so great for adding depth and shadows – it’s a mix of blue and black and incredibly useful. Payne’s grey and burnt umber are always my most used paints regardless of the type of paint I’m using.

Teelo helping out.
This is my oil painting palette. It’s a bit expanded from my basic list. I have extra browns, and a warm and cool of blue, red, and yellow.

I think it’s best to start with less in terms of colour. You can get a reasonable approximation of many observed colours with the list provided here and as you learn more you can add judiciously to your palette. Sometimes there may be a modern colour that you observe that you will not be able to mix no matter how hard you try (fluorescent orange would be an extreme example). In this case you would have to purchase.

Note – you don’t need black to start! Try to work around it. Use your complementary colours, neutral grey, even Payne’s grey. Acrylic and oil painters will also want to add titanium white to your shopping list (or your favourite white – there are a few with different properties, I personally like titanium for its strong tinting strength and opacity).

A note on green and black.

Green is not a primary colour and there are not a lot of naturally-occurring green pigments. The picture above shows some examples of green. You can always mix green yourself with the palette I suggested. Sap green is a dark, earthy green with beautiful yellow undertones that you can purchase. It’s a favourite of mine. Turquoise and permanent green are a little less natural looking for painting landscapes but have their uses – always use green carefully. Especially with oil painting it can kind of infiltrate and infect and tint your whole palette if you’re not careful, you can easily cast everything in a sickly glow.

Black was one of the first pigments used by prehistoric artists – charcoal was one of the first drawing tools after fire was invented. 😝 We’ve touched on black a few times but this is important so here we are again. If you don’t have black in your palette, one work-around mix is ultramarine blue plus burnt umber as shown above – it gives you a really rich, earthy black colour. Some examples of blacks you can purchase are lamp black and ivory lack. Every line of good quality paint will offer a few blacks and these all have different properties (much likes whites). You can see the lamp black above is more transparent than the ivory black which has better covering power. Ivory black is a good, all-purpose black. Note my personal favourite, Payne’s grey on the end which can be used as a kind of black-alternative. It’s a cool black, and is a mix of ultramarine blue and ivory black.

Putting it all together.

I created this very quick painting as an exercise to show a little colour theory in practice. I used gouache paints. I started with lemon yellow, which is both fitting name-wise and colour wise. It’s a coolish yellow. I went back in with a lemon yellow darkened with some purple. I started with a more yellow mixture that I progressively darkened with more purple until I achieved a neutral grey for the most shaded areas. I used a light purple background to make the yellow lemons pop, and amplified that effect with a bright purple tabletop. I darkened the shaded areas of the table with a little more purple toned with corresponding neutral grey. I highlighted the lemon with some opaque white. No black used but representational highlights and shading achieved. The colour scheme is pleasing because it makes use of complementary colours.


This was a long post to write, but in fact this has been a very, very quick discussion of colour theory in a really tiny nutshell. If you look up colour theory online there are so many useful resources and so much has been written about this topic. For beginner painters reading this: When you go to mix colours, try not to get too lost in the details. It really is something that is learned with time, it does become intuitive, and you will kind of memorize your go-tos. It is truly more of an art than a science. I’ve tried to give you some guiding principles to follow, but there aren’t a lot of hard and fast rules.

I do recommend that you try to take a more holistic approach when you’re trying to figure out how to paint something, and how to mix your colours. Really study what you are painting. Say you’re painting a portrait of a brunette. The brown in her hair – are there blonde (yellow) highlights? Is there a red undertone? Is it dark brown, veering more towards black and more towards cool undertones (like raw umber and Payne’s grey?).

When you study the world around you, when you really look at it, you’ll notice that there are all sorts of colours in someone’s hair, in the petals of a flower, in the dark of the shadows cast by a building on a sunny day. The more you can perceive those, and suggest these colours and transitions between colours in your work, the closer you will get to representing the world as you see it, through your painting.

And that’s it!

For those of you starting out, I hope this helps! For all of you who have taken the time to read this, I thank you! Any questions? Feel free to ask in the comments below.


3 Replies to “One fish, two fish. Red fish, blue fish.”

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