Marcus Chen
Paint is made up of four main ingredients: pigments, binders, solvents, and additives. Pigments are finely ground particles that give paint its colour. They are usually solid, granular particles suspended within a liquid medium. Pigments have distinct properties, and they can be made from natural sources like minerals and plants, or created synthetically. They are key to creating the final product.
| Characteristics | Values |
|---|---|
| Purpose | Provide colour |
| Physical form | Solid, granular particles |
| Origin | Mineral, organic or synthetic |
| Categories | Pigments and dyes |
| Examples | Titanium dioxide, iron oxide, hansa yellow, phthalo blue, red oxide, yellow ochre, umber, clay, silica, diatomaceous silica, calcium carbonate, talc, zinc oxide |
| Function | Adhere to surfaces |
| Durability | Resistant to fading |
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What You'll Learn
- Pigments are the colouring substance in paint
- Pigments usually have a mineral or organic origin
- The development of organic chemistry has reduced the use of inorganic pigments
- Pigments are ground into a stiff paste with a binder to make paint
- The International Organization for Standardization (ISO) develops technical standards for pigment manufacture
Pigments are the colouring substance in paint
Paint is made up of four main ingredients: pigments, binders, solvents (liquids), and additives. Pigments are finely ground particles that give paint its colour. They are key to creating a colour system.
There are two primary types of pigment: those that contribute to wet and dry hide in paint. Titanium dioxide (TiO2) is the most expensive pigment and contributes directly to a paint's wet hide while providing whiteness.
Colourants are prime pigments that provide the actual colour within the paint can. There are two main types: organic and inorganic. Organic colourants provide brighter colours, such as hansa yellow and phthalo blue. Inorganic colourants include duller, earthy colours and are more durable for exterior paint applications. Examples of these pigments include red oxide, yellow ochre, and umber.
Extender pigments are lower-cost pigments that give extra weight or bulk to the paint. While they only contribute to a paint's dry hide, they are necessary for controlling gloss. Some extender pigments also provide additional film performance in scrub or abrasion resistance areas.
Pigments are solid substances that remain on the surface after the paint dries, giving it its hue. Unlike dyes, which absorb into the material being coloured, pigments are preferred for their durability and resistance to fading.
The function of pigment in paint is to provide colour. For example, titanium dioxide is a common white pigment used to make paints bright and opaque. Similarly, iron oxides can create various shades of red, yellow, and brown.
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Pigments usually have a mineral or organic origin
Pigments are finely ground particles that give paint its colour. They are either organic or inorganic.
Organic pigments are those that contain carbon molecules, which can include plant extracts or petrochemical preparations. They are less stable than inorganic pigments and are often bonded to a mineral (inorganic) base for stability. Organic pigments made from natural sources have been used for centuries, but most organic pigments used today are synthetic and derived from coal tars and other petrochemicals.
Inorganic pigments are made by relatively simple chemical reactions, notably oxidation, or are found naturally as earths. They are brighter and last longer than organic pigments. The majority of pigments used today are either inorganic or synthetic organic. Inorganic pigments include white opaque pigments used to provide opacity and to lighten other colours. The most important member of this class is titanium dioxide, which is the most costly pigment. Inorganic pigments are generally more durable for exterior paint applications. Examples include red oxide, yellow ochre, and umber.
Mineral pigments are pigments that are sourced from minerals. All coloured earth pigments are mineral pigments. Ochre, the first colour of paint, is an iron oxide pigment. A favoured blue pigment was derived from lapis lazuli.
Synthetic pigments are pigments that have been manufactured or put through a process. Oxides can be fired in a kiln (calcined) to change the colour of the pigment. White minerals such as chalk or lime can be bonded to an organic pigment or dye to create brighter coloured pigments not available from a natural earth source.
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The development of organic chemistry has reduced the use of inorganic pigments
Paint generally consists of four main ingredients: pigments, binders, solvents (liquids), and additives. Pigments are finely ground particles that give paint its colour. There are two primary types of pigment: organic and inorganic.
Organic pigments are preferred as they tend to be brighter and more stable. They are made from natural sources and have been used for centuries. However, they are more expensive than inorganic pigments. Inorganic pigments, on the other hand, are cheaper and are heat and light stable. They include duller, earthy colours and are more durable for exterior paint applications. Examples of inorganic pigments include red oxide, yellow ochre, and umber.
The development of organic chemistry has led to the discovery and synthesis of new organic pigments. These organic pigments have several advantages over inorganic pigments, which has resulted in a reduced use of inorganic pigments. Firstly, organic pigments can produce brighter colours. For example, organic pigments such as hansa yellow and phthalo blue are brighter than their inorganic counterparts. Secondly, organic pigments are more stable and less prone to degradation. This is especially important for preserving artworks and historical artefacts. For instance, carbon-based black pigments used in paintings can react with the drying agent and binder, forming lead carboxylates, or even burn at high temperatures.
Furthermore, some inorganic pigments contain toxic heavy metals, which has led to their limited or prohibited use. Chromate pigments, for example, are rarely used due to environmental problems associated with chromium. Similarly, cadmium compounds have been mostly phased out due to their high toxicity. This shift towards organic pigments is driven by both the advantages of organic pigments and the limitations of inorganic pigments.
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Pigments are ground into a stiff paste with a binder to make paint
Paint is made up of four main ingredients: pigments, binders, solvents (liquids), and additives. Pigments are finely ground particles that give paint its colour. When making paint, pigments are ground into a stiff paste with a binder. Binders are ingredients that provide a binding effect, holding the pigments together to create a dry film on the surface. Examples of binders include acrylic resin, commonly used in acrylic paints, and linseed oil, used in oil paints.
There are three main types of painting pigments: water, gouache, and oil paints. All three types start from the same powdered pigment, but the making process is what makes them different. Watercolour pigment is the most common, while gouache paint is opaque, and both are water-based. Oil paint is more different in terms of preparation.
To make paint, you will need tools and ingredients. For watercolour pigment, you will need powdered pigments, liquid gum Arabic, and water. For gouache paint, you will need to add chalk/calcium or alcohol. For oil paint, you will need earth and mineral pigments, gum Arabic powder, and refined walnut oil.
When making paint, it is important to note the safety of the pigments. Some natural pigments contain lead and might need special safety measures before preparation. It is recommended to work with them using protective goggles and a dust mask, especially if crushing stones. Gloves can also be worn if there is a worry of the pigment getting on the skin.
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The International Organization for Standardization (ISO) develops technical standards for pigment manufacture
Pigments are finely ground particles that give paint its colour. There are two primary types of pigment: titanium dioxide (TiO2), which is the most expensive pigment and contributes to a paint's wet hide, and colourants, which provide the actual colour within the can.
The International Organization for Standardization (ISO) is a non-governmental, independent organisation that develops and publishes standards for manufacturing and industry. It was founded in 1947 and is composed of representatives from 167 countries. The purpose of the ISO is to establish consistent quality and safety standards for products sold internationally.
ISO develops technical standards for pigment manufacture through its technical committees and subcommittees. These committees follow a six-step process to develop standards, which includes setting up working groups of experts to prepare working drafts. The standards developed by ISO cover a wide range of areas, including manufactured products, technology, food safety, transport, IT, agriculture, and healthcare.
ISO also publishes technical reports, specifications, guides, and corrections. Some examples of ISO standards include the calibration of thermometers, food safety regulations, and the manufacturing of wine glasses. The two most widely adopted ISO standards are ISO 9001, which provides criteria for quality management systems, and ISO 14001, which provides criteria for environmental management systems.
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Frequently asked questions
Pigment is the substance that gives paint its colour. Pigments usually have a mineral or organic origin, although some are artificially produced.
Minerals have been used as colourants since prehistoric times. Ochre, or iron oxide, was the first colour of paint. Other natural pigments include indigo, which is used to dye jeans, and cochineal, which comes from the shells of insects.
The first known synthetic pigment was Egyptian blue, which is believed to have been created by heating a mixture of quartz sand, lime, a flux, and a copper source such as malachite. Other artificial pigments include lead white and synthetic ultramarine.
Pigments can be broadly categorized as organic or inorganic. Organic pigments are derived from living sources, such as plants and animals, while inorganic pigments are usually derived from minerals. Inorganic pigments are most commonly used for white and blue colours, with Phthalocyanine being the most common blue pigment.
