The Original Martin–Schultz Scale: Method for Eye Color Classification
The Martin–Schultz scale is a system used to classify and describe human eye color based on the amount of melanin present in the iris. Unlike simplified scales, the original version distinguishes a wide range of hues and subtle variations. Below is an in-depth look at each step of the scale, along with notes on the visual qualities and underlying melanin levels.Blue eyes color
1a: Pale-blue Iris
This iris exhibits an extremely light, almost translucent blue. Its delicate hue is so faint that the iris may appear to be nearly colorless under certain lighting conditions.Melanin Level: Very low, allowing light to scatter through the iris and produce an ethereal, airy effect.1b: Light-blue Iris
A soft light-blue tone with a clear and gentle appearance. This iris maintains a subtle but distinct blue color, offering a slightly deeper impression than the pale-blue variant.Melanin Level: Low; enough pigment is present to establish a stable light-blue hue without significant depth.1c: Sky-blue Iris
Reminiscent of a clear daytime sky, this iris is bright, vibrant, and refreshing. The blue tone here is more pronounced than in the previous categories, with a slight gradient that adds dimension.Melanin Level: Still very low, permitting a vivid blue that changes subtly with natural light.2a: Blue Iris
A classic blue iris with a solid, vivid color. The blue here is more intense, offering a striking, uniform hue that stands out clearly.Melanin Level: Low, but enough to create a noticeable saturation that defines a true blue.2b: Dark-blue Iris
This iris features a deeper and richer blue tone. With an increased concentration of pigment, the color appears more saturated and may look almost velvety under certain lighting conditions.Melanin Level: Slightly higher than in lighter blue variations, contributing to its enhanced depth.Gray eyes color
3: Blue-gray Iris
Combining the cool qualities of blue with the neutrality of gray, the blue-gray iris offers a muted, elegant appearance. The color can vary from subtle hints of blue to a more balanced mixture with gray.Melanin Level: Moderate; the blend of pigments results in a softer, less vibrant tone compared to pure blue.4a: Light-gray Iris
This iris presents a gentle, almost pastel gray, sometimes with a whisper of blue that emerges in favorable light. Its appearance is soft and delicate.Melanin Level: Low; the sparse pigment creates an airy, translucent quality.4b: Dark-gray Iris
A more intense gray that borders on charcoal, this iris exudes depth and complexity. The dark-gray shade offers a sophisticated, understated look.Melanin Level: Moderately low; there is more pigment than in light-gray eyes, leading to a denser appearance.5: Blue-gray Iris with Yellow/Brown Spots
This category takes the blue-gray base and adds speckles or spots of yellow or brown. These accents create a dynamic, textured look, making the iris appear as if it holds a miniature landscape of colors.Melanin Level: Slightly higher than pure blue-gray due to the additional pigmentation in spots, which adds visual complexity.6: Gray-green Iris with Yellow/Brown Spots
Blending gray and green tones with scattered yellow or brown spots, this iris shows a striking mix of cool and warm hues. The overall effect is dynamic, with the color shifting slightly depending on the angle and intensity of light.Melanin Level: Moderate; the diverse pigments create an eye-catching and ever-changing visual impression.Green eyes color
7: Green Iris
A pure, vivid green that is both rare and captivating. The green iris is characterized by its clear, fresh appearance, standing out due to its natural brightness and uniformity.Melanin Level: Moderate; sufficient pigment is present to achieve the vibrant green, but still low enough to allow the brilliance of the hue to shine through.8: Green Iris with Yellow/Brown Spots
This iris takes a standard green base and intersperses it with fine spots of yellow or brown. The resulting effect is one of increased depth and intricacy, as the added spots contribute to a more complex visual texture.Melanin Level: Moderate to moderately high; the additional pigment in the spots enhances the overall richness of the iris.Amber eyes color
9: Amber Iris
Amber irises exhibit a warm, golden tone reminiscent of resin or fossilized tree sap. The amber hue gives the eye a glowing, sunlit quality that is both inviting and distinctive.Melanin Level: Moderate; the presence of pigment is balanced in such a way as to create a luminous, warm effect without overwhelming saturation.10: Hazel Iris
Hazel eyes are complex, combining elements of brown, green, and amber. The color can appear to shift depending on the lighting conditions, sometimes looking greener or browner at different times. This variability makes hazel eyes particularly intriguing.Melanin Level:Moderately high; a diverse mix of pigments creates the multi-dimensional, ever-changing appearance of hazel eyes.Brown eyes color
11: Light-brown Iris
This iris is characterized by a warm, light brown shade that often carries hints of gold or honey. It has a softer appearance than darker browns, with the light reflecting to create subtle highlights.Melanin Level: High enough to impart a warm tone while still preserving a certain luminosity.12: Medium-brown Iris
Representing a balanced brown, this iris is neither too light nor too dark. It is a common and natural eye color, offering a harmonious blend of depth and softness.Melanin Level: Moderate to high; the pigment concentration provides a stable, even tone that appears natural in most lighting conditions.13: Dark-brown Iris
With a deep, rich brown that sometimes appears almost black in dim lighting, the dark-brown iris exudes intensity. It may also reveal subtle warm undertones when exposed to bright light.Melanin Level: Very high; the dense pigment results in a powerful, opaque appearance with minimal light transmission.14: Mahogany Iris
This iris features a reddish-brown, mahogany tone that is both warm and complex. The color mimics the rich hues of mahogany wood, with an interplay of red and brown that provides a unique, luxurious effect.Melanin Level: Very high; the pigment distribution creates an intricate pattern of warm reds interlaced with deeper browns.15: Black-brown Iris
A nearly opaque iris that is dark brown at first glance but reveals hints of brown upon closer inspection. This category is characterized by its mysterious and deep appearance.Melanin Level: Extremely high; the concentration of pigment is such that the iris appears almost black, yet with a trace of brown nuance visible under certain lighting.16: Black Iris
Representing the highest melanin content, the black iris is intensely dark and nearly impenetrable to light. Its uniform, deep color is so dense that it is often perceived as completely black, with only the slightest variation under direct, bright light.Melanin Level: Maximum; the overwhelming pigment concentration prevents any light scattering, giving the iris a pure black appearance.
