Dyes and pigments are substances that impart color to a material. The term colorant is often used for both dyes (also called dyestuffs) and pigments. The major difference between dyes and pigments is the particle size. Dyes are much finer than pigments. Therefore dyes are not UV stable whereas pigments are usually UV stable.
Dyes, also known as colorants in which the coloring matter is dissolved in liquid, are absorbed into the material to which they are applied.
Pigments, on the other hand, consist of extremely fine particles of ground coloring matter suspended in liquid which forms a paint film that actually bonds to the surface it is applied to.
In polished concrete process dyes are used because they penetrate deeper into the concrete surface do not wear off during the polishing phase.
The major differences between dyes and pigments are –
| Dyes | Pigments | |
| Solubility | Soluble in many liquids | Insoluble in water and most of the solvents |
| Number | Available in large number | Comparatively lesser in number |
| Light fastness | Lower dyes are very much vulnerable. Lights destroy colored objects by breaking open electronic bonding within the molecule | Traditionally pigments have been found to be more light fast than dyes |
| Product resistance | Lower as compared to pigments | Very high |
| Size | Dye molecules are comparatively smaller; it’s like comparing a football (pigment) to say a head of a pin (dye) | Pigment particles are about 1-2 microns in size. It means that the particles can be seen under a magnifying glass |
| Bonding | Dye molecules have electrostatic charges that serve as a method for attaching the dye to the concrete | Pigment requires the help if a binder for gluing. As it is an inert substance which si merely suspended in a carrier/binder |
| Imparting colors | Dyes can impart color by selective absorption of the dyes | Pigments impart colors by either scattering of light or by selective absorption |
| Combustible Properties | Combustible | Non-combustible |
| Chemical Composition | Organic compounds | Normally inorganic compounds, often involving heavy toxic metals |
| Longevity | Do not last as long as pigments | Last longer than dyes |
You can watch HERE the application of concrete dyes during the polishing of self leveling concrete topping.
Which Should You Use: Dyes or Pigments?
Choosing between dyes and pigments depends largely on the type of decorative concrete project and the performance requirements of the floor.
Concrete dyes are best suited for projects where vibrant, translucent colors and subtle variations are desired. Because dyes are soluble colorants that penetrate into the concrete surface, they can produce rich tones and layered color effects that are difficult to achieve with pigments. Dyes are commonly used in polished concrete floors, decorative interior floors, and artistic concrete applications where a wide range of colors is required.
However, dyes typically have limited UV stability, which means they are best used for interior environments where the floor is not exposed to direct sunlight.
Pigments, on the other hand, are insoluble color particles that are dispersed within a material such as concrete, overlays, or coatings. Because pigments are embedded within the material rather than simply penetrating the surface, they tend to provide greater color stability and durability. Pigments are commonly used for integral coloring of concrete, microtoppings, overlays, and cement-based flooring systems.
Pigments are also more resistant to UV exposure, making them suitable for both interior and exterior decorative concrete applications.
In many decorative concrete projects, contractors use both pigments and dyes together to achieve the desired visual effect. Pigments may be used to create the base color of the floor, while dyes are applied afterward to add depth, highlights, or artistic color variations.
Ultimately, the choice between dyes and pigments depends on the design goals, environmental conditions, and type of decorative concrete system being installed.
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