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Is indigo and violet the same color?

Is indigo and violet the same color?

Indigo and violet are two shades on the visible spectrum that are very close to one another and often confused as the same color. While they may look similar to the naked eye, indigo and violet are distinct shades with some key differences. Understanding the history, science, and cultural associations behind indigo and violet can help differentiate these two intriguing colors.

Definitions of Indigo and Violet

Indigo and violet represent different wavelengths of light on the visible color spectrum. Sir Isaac Newton first defined the visible spectrum in 1666, dividing it into seven distinct color bands – red, orange, yellow, green, blue, indigo, and violet. Modern scientists define these wavelengths as:

Color Wavelength (nm)
Violet 380-450
Indigo 445-425

As seen in this table, violet has a shorter wavelength, closer to UV light, while indigo wavelengths are slightly longer. To the human eye, both appear as deep purplish-blue tones. But when directly compared side-by-side, some key differences emerge.

Violet is closer to the edge of the visible spectrum, meaning it appears more blue and luminous, similar to a light purple. Indigo has more red and blue undertones, creating a deeper, darker shade. Many describe indigo as having a glossy, shimmery finish compared to the matte tones of violet.

While they can look similar, when directly compared indigo and violet are noticeably different shades. Understanding the technical definitions behind the colors based on their light wavelengths proves they are distinct.

History of Indigo and Violet

Historically, indigo and violet have their own unique backgrounds representing their place along the color spectrum.


One of the oldest dyes used for textiles and art, indigo has worldwide cultural significance. In India, indigo dye was used in traditional clothing and art for centuries. The vivid blue color held spiritual meaning in Hinduism. During the colonial era, indigo became one of the most valued global commodities, leading to massive production from India and other colonies to dye clothing.

Today, indigo remains an important dye used for denim and other fabrics. Over history, the rich blue of indigo has been associated with depth, power, and integrity across many cultures.


In past eras, violet’s rarity in nature made it synonymous with spirituality and royalty. The pale purple shade is hard to produce naturally, only found in a few flowers. In Ancient Rome and Greece, the color was associated with extravagance and ceremony due to the high cost of violet dyes. Christian churches used violet robes and tapestries to represent humility and temperance.

Violet also gained significance from its place at the short wavelength end of the visible light spectrum. To Isaac Newton it symbolized the union of body and spirit. The hue invokes nostalgia and imagination, frequently used in art and media to represent fantasy, mysticism, and dreams.

Looking at the rich cultural histories of indigo and violet makes it clear they have their own distinct symbolic meanings, despite their similar appearance.

Scientific Properties of Indigo and Violet

On a scientific level, indigo and violet interact uniquely with light and perception in ways that further set them apart.

Light Absorption

The different molecular structure of indigo and violet pigments means they absorb light differently. Violet absorbs wavelengths from around 400-500 nm, reflecting back violet and blue light to our eyes. Indigo absorbs 450-520 nm wavelengths, reflecting blue and some red wavelengths.

This selective light absorption gives each color its signature property. Violet shades have a cool, luminous glow, while indigo has a glossy sheen with hints of red undertone.

Cone Cell Activation

The cones cells in our eyes also respond distinctly to indigo versus violet colored light. Violet most strongly activates the S or blue cones. Indigo stimulates both blue and red cones more evenly. This cone cell stimulation creates the subtle difference we perceive between the two colors.

Color Vision Deficiency

People with color blindness may also perceive indigo and violet differently. For example, those with red-green deficiency have trouble distinguishing indigo from blue but can see the violet end of the spectrum. This is another indicator of the subtle physical difference between the shade wavelengths.

Use in Art, Design and Culture

Artists, designers, and cultural traditions utilize indigo and violet in unique ways that reveal their distinctive identities.


Indigo and violet pigments have different chemical makeups. Traditional indigo dye comes from the indigofera plant while violet pigments traditionally came from manganese or mineral compounds. This means they produce different textures and interact with other media differently when used in art.

Color Theory

Violet is considered a primary color in traditional RYB color theory, while indigo is a tertiary color, a mix of blue and violet. In painting, violet is used as a pure chroma along with red and blue to mix other hues. Indigo mixes darkness and lightness from its blue-red blend.


As mentioned, indigo and violet hold unique cultural symbolism. Indigo represents constancy, dignity, and intuition. Violet is associated with spirituality, nostalgia, and extravagance. Using one over the other in art, media, or marketing invokes a different mood based on these long-held associations.

Everyday Identification

Because indigo and violet can appear similar at a glance, how can someone reliably tell them apart in everyday situations?

Here are some tips for identifying an ambiguous color as either indigo or violet:

– Compare it side-by-side to known samples of both colors. The differences become more clear when directly contrasted.

– Check if it has a glossy, shimmery finish – a hallmark of indigo – versus a matte, muted tone signaling violet.

– Look closely for red undertones, which indicate indigo over straight violet.

– View it next to coordinating colors – indigo pairs well with yellows and violets go best with greens and pinks.

– Consider the context – is the color used in a mystical, spiritual context suggesting violet? Or does its use seem designed to convey integrity and depth, indicating indigo?

With close inspection and consideration of the context, anyone can train their eye to accurately differentiate between indigo and violet in any situation.


While indigo and violet may initially appear interchangeable to the naked eye, they are definitively unique shades with their own scientific properties and cultural histories. Indigo has a glossy, shimmering finish with hints of red, absorbing primarily blue and red light wavelengths. Violet is luminous and muted, absorbing mainly blue/violet wavelengths of light.

Artists mix the colors differently, and they evoke different symbolic associations. So be sure to look closely to discern indigo from violet based on finish, undertones, and context. Though often confused, they are distinct colors representing separate points along the enchanting visible spectrum.