Guides
Understanding colour
Painting a model can be a very enjoyable and rewarding experience but, as with all aspects of the modelmaking hobby, a poor understanding of the basics can often lead to disasterous results. This, the first of the HobbyShed painting guides, takes you right to the beginning, explaining what colour actually is, what colours can be mixed together, what results they'll yield, what colours work well together and what colour combinations are best avoided.
If you're totally new to painting, or need a refresher, this article is essential reading before you pick up that paintbrush!
What is Colour?
When you see colour you're actually seeing the end result of your eye and brain interpreting a beam of light. Actual objects don't have any real colour. When light bounces off a surface it produces a wavelength and differing wavelengths produce what we perceive as different colours.
Inside the human eye are three receptors that relate to colour, each limited to what wavelengths they can see in the spectrum of light. Although commonly referred to as "red receptor", "green receptor" and "blue receptor", their range is wider and more mixed than their names suggest.
The Colour Spectrum
The colour spectrum is the range of visible colours which make up white light. Rainbows are good examples of naturally occuring colour spectrum. The purity of their colour depends on the size of the raindrops (rain is a mixture of many shapes and sizes of drops).

Primary Colours
The term "primary colours" refers to a set of colours that can be combined to make a further, useful range of colours.
Although the human eye has red, green and blue receptors, you'd be forgiven for assuming these are the only primary colours. As a young school child, you may have been told that the primary colours are red, yellow and blue and mixing paints in these colours would produce any other colour. Later on however, perhaps in science lessons, you may have been told that the primary colours are red, green and blue, this relating to the receptors in the human eye. Later still, you may have noticed that colour producing machines, such as inkjet printers, for example, use cyan, magenta and yellow inks.
So, what are the primary colours? Well, the truth is, there's more than one set, each relevant to a number of subjects but the set relevant to art (and, yes, modelmaking is an art) does indeed consist of red, blue and yellow, just as you were probably taught early on at school.
Secondary Colours
Secondary colours are colours which are created by mixing just two primary colours. The resultant colour will of course depend on which pair of primary colours you are using and in what amounts you mix them. Primary paints give the following results when mixed in equal quantities:
RED |
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BLUE |
= |
VIOLET |
RED |
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YELLOW |
= |
ORANGE |
BLUE |
+ |
YELLOW |
= |
GREEN |
Tertiary Colours
Tertiary colours are obtained by mixing a primary and secondary colour together.
RED |
+ |
ORANGE |
= |
RED-ORANGE |
RED |
+ |
VIOLET |
= |
RED-VIOLET |
BLUE |
+ |
VIOLET |
= |
BLUE-VIOLET |
BLUE |
+ |
GREEN |
= |
BLUE-GREEN |
YELLOW |
+ |
GREEN |
= |
YELLOW-GREEN |
YELLOW |
+ |
ORANGE |
= |
YELLOW-ORANGE |
Pigmentary Colours
Pigment is a word used to describe a dry colorant.
Colorants usually come in the form of insoluble powders and are used to give colour to paints, plastics and rubber. Commercial pigments used in paints and inks can be divided into naturally occurring pigments such as red iron oxide, inorganic pigments (made from minerals), organic pigments and lakes (pigments combined with a metallic compound such as salt or oxide).
Theoretically, the three primary colours of red, yellow and blue really can be mixed to generate all other colours. This is good news for modellers on a very tight budget as buying a single pot of red, blue, yellow, black and white will enable you to mix up a vast range of colours.
Pigments work by absorbing light, so in theory a mixture of the three primary colours of red, yellow and blue should absorb all light, resulting in black, though you can't create it using just any old shade. Achieving a good black in this way does prove very difficult, so much so that it often isn't worth the effort trying.
Colour Wheel
The colour wheel is a visual aid that shows the relationship between colours. The relative positions of its colours is an indication of how they will work together. There are over two million recognisable colours and they can all be made from the primary colours in the colour wheel.

Colour Harmony
Below are the meanings for other terminology used in relation to colour:
Achromatic Represented by the scale of white, through grey, to black, achromatic means 'without colour'.

Monochromatic This refers to one colour (or family of colour) with white to lighten and black to shade.
Hue An element of the colour wheel, hue is a word used to refer to the name of a pure colour without tint or shade. Manufacturers of pigments also use the word hue ('Cadmium Yellow (hue)', for example) to indicate that the original pigmentation ingredient, often toxic, has been replaced by safer alternatives whilst retaining the hue of the original.
Opposite and Complementary Colours
You can work out the opposite colour to any primary colour by taking the other two primaries and mixing them together. The result will be its opposite or 'complementary' colour. Opposite colours appear diagonally opposite one another on the colour wheel.
Analogous Colours Found next to each other on the colour wheel, analogous colours are harmonious together.
Contrasting Colours Demonstrated below is how contrasting colour affects the same red square. On the black background, the red square appears larger and more brilliant in colour but on the white background it appears duller. On the orange background, the red square appears duller and it is harder to see yet on the green background the red square seems its most brilliant.
Light-on-light, dark-on-dark, or colours close to one another on the colour wheel don't have a great deal of contrast.
Intensity The brightness or dullness of a colour shows its intensity. A pure hue is a high-intensity colour. A dulled hue, a colour mixed with its complement, is called a low-intensity colour.
Warm and Cool Colours Red, orange and some yellows and purples are generally considered warm colours and blue, green and other yellows and purples are similarly regarded as cool colours. It's all down to how we see things psychologically. We associate blue with water, ice and sky, for example.
Neutral Colour This refers to colours that are not bright or intense.
Tints, Tones and Shades Tints
are colour with added white (the lightest value of light). White is not considered a colour as it has no hue or intensity; only value. Tones are colour with added middle-value colourless grey. Shades are colour with added black (the darkest value of light).
Like white, black is not considered a colour due to it having no hue or intensity; only value.
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