Natural paints do not look the same as plastic paints. There are scientific reasons for this which are fascinating but complicated, so in summary, for those who want to understand more...
- How we see pigment
We do not see colours made from natural pigment and synthetic dyes in the same way as light is reflected from them very differently. Natural pigments produce a richer and more nuanced colour. We just use 12 natural pigments, including black and white, to make all 102 colours.
- Colour and how we perceive it
The science of colour in paint making is about paint ingredients - how natural paint is made, the behaviour of light and how the colour spectrum works with the human eye. This is all about the binder! Plastic binders have a huge impact in how the colours look, natural binders are much softer, calmer, gentler on the eye.
- Measurement of colour
Attempts to measure and classify colours according to human perception has a long history, however since the invention of photo-spectrometers clear and objective measurement of colour can be achieved. But people will always see colour differently.
- Our natural pigments
With an understanding of the physics of light and colour we can examine how paints and coatings are coloured and how different types of colouration are achieved. The big change in modern paint manufacturing is that most companies have replaced natural pigments with azo dyes which are rather bland.
- Texture and colour
If the surface of the sample is very smooth, light will be reflected from that smooth surface like a mirror at the same angle and with the same spectral range. This affects the appearance of the colour, the higher the gloss, the darker the colour appears whereas a textured surface with the same pigmentation will appear to be of a lighter shade.
- Other influencing factors on colour
- Scattering of light by pigments, transmission of light through the paint film, scattering co-efficient of a pigment, pigment load of a paint film, thickness of the paint film.
Edward's favourite conversation is about Metamerism......
- Metamers are colours that can look the same under one set of conditions but different to one another under others. When the spectral curve of two colours crosses in at least thee places metamerism is likely. Under different light conditions the difference in colour becomes apparent. This is why synthetic colours can look quite different in artificial light as opposed to daylight.