- Where do they come from?
- Which are 'old' colours and which are new?
- What or who creates them?
Colour in paint comes from pigments and dyes. All media – oils, watercolours, acrylics, pastels and coloured pencils – are derived from the same pigments and dyes. What actually varies between different media is the vehicle used to bind the pigment together.
Some pigments and dyes have been around for a very long time and some are modern and the result of recent manufacture. Basic colour knowledge relating to materials covers an elementary understanding of:
- What are organic and inorganic pigments and dyes and where do they come from
- The relationship between pigments and dyes and lightfastness
- ‘Old’ pigments still in use – and those which have been replaced
- ‘New’ pigments created in the laboratories – and why they are a good thing
What are pigments and dyes? (Definitions)
What is pigment and what is a dye? How does a pigment differ from a dye?
At a basic level:
- do not dissolve in water and may be opaque.
- Even when ground down, particle sizes are much larger than a water molecule.
- Pigments are used by artists.
- dissolve in water,
- are always transparent and
- can bind permanently to all porous materials.
- Dyes are mostly used in industry.
A pigment is a material that changes the color of light it reflects as the result of selective color absorption.......permanence and stability are desirable properties. Pigments that are not permanent are called fugitive. Fugitive pigments fade over time, or with exposure to light, while some eventually blacken.You use dyes to dye to produce a dyed colour! Confused? See below for an explanation....
Wikipedia - pigment
The colouring agent in drawing and painting media. originally from natural plant and mineral sources, most pigments are now synthentic. Pigment also refers tp pure colour in powder form
Artists Colour Manual"
Pigments are powders that are in a binder such as acrylic or oil which covers or adheres to a surface.
pigment noun 1 any insoluble colouring matter that is used in suspension in water, oil or other liquids to give colour to paint, paper, etc. Compare dye. 2 a coloured substance that occurs naturally in living tissues, eg the red blood pigment haemoglobin, or chlorophyll in the leaves of green plants. verb (pigmented, pigmenting) to colour something with pigment; to dye or stain. pigmentary or pigmented adj.
ETYMOLOGY: 14c: from Latin pigmentum, from pigere or pingere to paint.
dye verb (dyed, dyeing) tr & intr to colour or stain something, or undergo colouring or staining often permanently. noun 1 a coloured substance, either natural or synthetic, that is used in solution to impart colour to another material, eg paper, textiles, leather, hair. Compare pigment. 2 the solution used for dyeing. 3 the colour produced by dyeing. dyable or dyeable adj. dyer noun someone who dyes cloth, etc, especially as a business.Organic and Inorganic; natural and synthetic
ETYMOLOGY: Anglo-Saxon deagian.
Dye: A colouring agent that dissolves in water, used for colouring fabrics. Dyes are also used to colour white powder to produc 'pigment lakes' and 'pinks'. .....
Lake: The pigment colour produced by dyeing a white inorganic material such as gypsum or chalk with organi colouring matter through the use of a mordant
"Artists Colour Manual"
Dyes are pigments that are dissolved and absorbed in a fluid
Pigments are either organic or inorganic. This means whether or not the molecules contain carbon - organic pigments contain carbon.
This historical differentiation was based on a notion that organic means coming from things which were living and inorganic means it wasn't synthesized from a life force.
Today, there is a more defined separation between what is natural (from a living organism); what is synthetic (manufactured through a chemical process) and what is inorganic (not from a life force)
Today there are:
- natural organic pigments/dyes - these are pigments/dyes extracted from natural (animal and vegetable) sources and living organisms e.g. derivatives of madder or cochineal. They are chopped, ground, boiled and dried to extract the pigment powders. They have a tendency to fade.
- synthetic organic pigments/dyes - these are pigments/dyes that are manufactured as organic compounds e.g. alizarin crimson (a synthetic replacement for madder) and all the quinacridone colours (which are organic compounds and include the modern synthetic replacement for alizarin crimson because of concerns about the latter's weaknesses in relation to colour fastness)
- inorganic pigments/dyes - these are derived from naturally occurring earth colours (eg ochres and iron oxides ), metal compounds, minerals (e.g. cobalt) and clays.
- Julie C Sparks provides a lot of detail about the origins of different colours in Pigments: Historical, Chemical and Artistic importance of coloring agents
- webexhibits - Pigments in paintings - has a great amount of detail about different pigments - once you've entered the site, click the coloured bars at the top of the page.
- Wikipedia - pigment
- Bruce MacEvoy (Handprint) provides a very detailed explanation of the different attributes of pigments and dyes in the material attributes of paints
- Find more inormation in the information site I developed to support this project Colour - Resources for Artists. This will continue to be updated in future.
Not all pigments behave in the same way e.g. pigments can dry at different rates. Consequently it is worth trying to understand a little bit more about the characteristics of different pigments. (This is different from understanding the difference between different paints.)
The basic characteristics of a pigment vary as to:
- colour bias
- granulation/dispersion /sedimentation (try the Handprint sedimentation test )
- tinting strength
- staining and bleeding
- transparency or opacity
- Resistance to alkalis and acids
- Reactions and interactions between pigments
- drying rate
copyright Katherine Tyrrell
Differences between media and between different brands of one medium are significantly influenced by the different formulae used by different manufacturers and the extent to which they vary substances used to bind the pigment into the medium.
Pigments are used for coloring paint, ink, plastic, fabric, cosmetics, food and other materials. Most pigments used in manufacturing and the visual arts are dry colourants, usually ground into a fine powder. This powder is added to a vehicle (or matrix), a relatively neutral or colorless material that acts as a binder.Art media normally start with two principal ingredients:
Wikipedia - pigment
- colourant, commonly pigment (organic or inorganic);
- binder, the substance that holds the pigment in suspension and fixes the pigment to the painting surface
- additives, substances that alter the viscosity, hiding, durability or color of the pigment and vehicle mixture; and
- solvent, the substance used to thin or dilute the paint for application and that evaporates when the paint hardens or dries.
The main reasons why people like a particular art medium are due to:
- quality of the pigment used (eg how finely it is ground - is it gritty or not?)
- the nature of the binders and additives used (eg how well the paint flows or gives up its pigment)
- the ratio of binders and fillers to pigment (the pigment load)
- Dry binders include: wax, oil, clay/kaolin, graphite (Carbon mixed with clay)
- Liquid binders include: water, egg yolk+water, liquid, linseed oil, beeswax, acrylic polymer, gum arabic, oil, milk-derived polymer, powdered glass.
I'm aiming to produce a chart at some point showing how binders combine with pigments to produce different art media.
Permanence and lightfastness
In the last 200 years, the range of pigments and colours has increased but, more importantly, so has the lightfastness. This will be covered when I look at the classification of colour.
Prior to the advent of tube paint, most paints were made up by people called Colourmen who sold premixed paint in pigs bladders.
Pere Tanguey, painted three times by Van Gogh (see right), was one such colourman who supplied a number of painters in Paris at the end of the nineteenth century.
I've decided it might be useful to try and summarise what can be concluded from the overview
- all colours come from pigments or dyes;
- pigments and dyes come from a number of different sources
- a pigment is a material which can provide colour but which does not dissolve in water
- a dye is a pigment ground down to very fine particles which can impart colour when suspended in a solution or medium
- pigments do not all behave in the same way - because they come from different sources
- what makes paint vary can be the nature of the pigment - but it can also be the binder or filler used to make the medium. In other words it's not just about the pigment load.
The Making A Mark Project on Colour - previous posts
- Making a Mark - Colour and Color - an online project
- Making a Mark - Learning about Colour - Art Book Reviews for Artists #1
- Making a Mark - Using Colour - Art Book Reviews for Artists #2
- Making a Mark - What is Colour?
- Making A mark - Colour - a scientific perspective
- Making A mark - Book review: Multi Brand Color Chart for Pastels
- Making a Mark - Colour (all posts tagged colour)