When mixing different paint colors, the pigments contained in each color physically blend together. This mixture absorbs certain wavelengths of light and reflects others, creating a new color perceptible to the human eye.
When you look at a painted object, the color you perceive is actually related to the pigments in the paint, which absorb certain colors of light and send back or reflect others to your eye. Each pigment acts a bit like a filter: it selects the colors it allows to be reflected. A red pigment absorbs most colors except red, which it redirects to your eye. When you mix several different pigments, each absorbs complementary colors, gradually limiting the colors available to be reflected. Very quickly, by multiplying the pigments, the mixture becomes dark, often brown or dull gray, because each addition absorbs other colors, leaving less and less reflected light accessible. It's a bit like stacking filters: as you pile them up, there is little light left to see at the end. That's why mixing too many different pigments often results in a muddy or dull color.
When you mix paints, it is the pigments that come into play. The phenomenon involved is subtractive synthesis. Why "subtractive"? Because each pigment absorbs certain colors of the light that shines on it and only reflects certain others back to your eyes. If you mix blue paint (which absorbs reds and yellows) with yellow paint (which absorbs blues), primarily green remains to be reflected back to you. Each addition of pigment removes available colors to reflect, resulting in generally lower brightness: you get duller, darker colors as you keep mixing more paints together. It is the opposite of additive synthesis (like that of screens), where colored lights add up to produce white; with paint, the more you add, the closer you get to black or dark gray.
Not all paints are equal when it comes to mixing! The type of paint matters: acrylic paints tend to dry quickly and darken, while oil paints take longer but often maintain more vibrant and true colors. The quality of the pigments also plays a key role. Lower-quality paints often contain impure or synthetic pigments, resulting in muddy and dull mixtures. Higher-quality paints, on the other hand, use purer pigments that yield clean, bright, and predictable results when mixed. The opacity of the paints also affects the final result: opaque colors cover other pigments more, radically altering the expected outcome, while transparent colors subtly reveal the underlying hues.
The proportions of the paints used directly affect the shade obtained. A tiny change in the amount of one of the pigments can easily cause visible differences in the final mix. In simple terms, adding too much blue to a yellow can quickly yield a color closer to dark green than the nice apple green expected.
A homogeneous mixture, meaning well-mixed and uniform, is also crucial. If you mix your colors poorly, you risk having irregular areas, with some parts darker or lighter that dry leaving effects of inconsistency that are not particularly pleasant to the eye. Hence, the importance of thoroughly mixing your pigments to achieve a consistently uniform final shade.
When you look at a color, your eye is easily influenced by several things that you might not necessarily pay attention to. For instance, ambient light can completely change your perception: under a yellow bulb, colors appear quite different compared to natural light. Additionally, surrounding colors play a role: a gray placed next to a bright red will look different than the same gray placed near a light blue. The type of surface also comes into play: a glossy paint reflects more light than a matte paint, sometimes giving the impression of a brighter or slightly altered color. Even your own visual fatigue or your emotional state at the moment can slightly alter the way you see shades and hues. All these small details, combined, change the way your brain ultimately perceives a color.
The human eye can distinguish up to several million different shades of color. However, when mixing paints, even with just a few basic pigments (such as cyan, magenta, and yellow), it is already possible to obtain thousands of different hues simply by varying the proportions.
The mixing of paints is based on subtractive synthesis, unlike screens which use additive synthesis (red, green, blue). As a result, mixing all paint colors usually ends up producing a dark shade close to brown or dark gray, rather than white.
Some paint shades, known as metameric colors, may appear similar under one type of light but look very different under another light source (natural or artificial). This explains why a paint color purchased from a store can sometimes seem different once applied to the walls at home.
The term 'pigment' comes from the Latin 'pigmentum', which initially means a coloring substance. Pigments vary greatly depending on their origin: they can be mineral, organic, or synthetic, each having unique stability and color intensity when mixed.
The addition of white will lighten the color but tends to give it a pastel appearance. To lighten without this effect, it is better to use a lighter neighboring color on the color wheel, or a small amount of light yellow or ochre depending on the desired result.
The difference mainly comes from the way light interacts with the combination of transparent or opaque pigments. Translucent pigments allow previously applied colors or the support to remain partially visible, creating depth and subtle nuances, while opaque pigments completely obscure the underlying colors and produce sharper mixes, but often less visually complex ones.
To preserve vibrant colors, avoid direct complementary mixes such as red and green, or blue and orange, as they neutralize the brightness of the pigments and create grayish or brownish hues. Opt for mixes with fewer closely related colors on the color wheel to maintain the original intensity.
As it dries, the paint loses a significant amount of its water or solvent, which slightly alters its light refraction. Drying can also influence the dispersion of pigments and the surface light reflection, leading to a change in the hue, brightness, or gloss that was initially perceived.
The order does not directly affect the final result if the mixture is perfectly homogeneous. However, a step-by-step mixing approach allows you to control and adjust the nuance more easily, and to avoid unpleasant surprises. Therefore, adopting a gradual approach with intermediate tests is highly recommended.
When various primary or secondary colors are mixed together, the pigments gradually absorb more wavelengths. By absorbing a wide range of colors, only dark or low-intensity colors remain, which is why brown or dull colors often appear.
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