Charcoal Slate HC-178 by Benjamin Moore

If you’re searching for a paint color that effortlessly balances sophistication and versatility, let me introduce you to Benjamin Moore’s Charcoal Slate (HC-178). This isn’t just another gray—it’s a moody, nuanced shade with subtle green undertones that add depth without overwhelming a space. Whether you’re refreshing a single room or reimagining your entire home, Charcoal Slate has the kind of quiet confidence that makes it a standout choice.

First, let’s talk about its personality. Charcoal Slate is a deep, muted gray with a cool, calming presence. Its blue undertones give it a modern edge, while the hint of green softens it just enough to keep it from feeling sterile. This duality means it plays well with both warm and cool accents, making it incredibly flexible for different decor styles. Imagine it in a minimalist living room with crisp white trim and sleek black furniture, or in a rustic bedroom paired with warm wood tones and cozy textiles. It adapts without losing its character.

One of the biggest questions I hear is whether a dark color like this will work in smaller spaces. The answer? Absolutely—with a few smart choices. Charcoal Slate has an LRV (Light Reflectance Value) of 14.51%, which means it reflects very little light. In a small room, that can feel cozy rather than cramped if you balance it with lighter furnishings, mirrors, and plenty of lighting. Think of it as wrapping the room in a sophisticated embrace. If you’re hesitant, start with an accent wall or try it on built-ins or furniture to see how it feels before committing to all four walls.

Lighting is key with this color. In bright, natural light, those green undertones come forward, giving the space a refreshing, almost organic vibe. In the evening or in rooms with less light, it deepens into a rich charcoal that feels intimate and grounding. That’s why it’s such a great pick for bedrooms and home offices—it creates a serene atmosphere that’s perfect for unwinding or focusing. Just be sure to test a swatch in your space at different times of day to see how it shifts.

When it comes to finishes, you’ve got options. Eggshell or satin are my go-to choices for walls because they strike a balance between durability and a subtle sheen that adds dimension. Matte works beautifully for ceilings or if you want a more understated look. And since Charcoal Slate is touch-up friendly and highly washable, it’s practical for high-traffic areas like living rooms or entryways. Plus, with low VOCs, it’s a healthier choice for your home.

Now, let’s talk pairings. This color loves contrast. White Dove or Pure White trim makes it pop, giving a crisp, clean finish. For a bolder look, try brass fixtures or warm metallic accents—they play off the cool tones beautifully. If you’re into color blocking, consider complementary shades like soft blush pinks or deep reds (remember, red is its complementary hue on the color wheel) for an unexpected twist. And if you’re layering neutrals, lighter grays or creamy beiges keep things cohesive without feeling flat.

Wondering where to use it? Charcoal Slate shines in living rooms, where it adds depth behind a gallery wall or a statement sofa. In dining rooms, it creates an intimate, elegant backdrop for gatherings. Home offices benefit from its calming energy, and bedrooms feel like a retreat when wrapped in this hue. Even entryways make a strong first impression with this color setting the tone.

As for decor styles, it’s a chameleon. Modern farmhouse? Check—pair it with shiplap and reclaimed wood. Industrial? Absolutely—think exposed brick and metal finishes. Minimalist? Perfect for letting clean lines and simple furnishings take center stage. The versatility is endless.

A few pro tips: Always sample before you commit. Paint a large swatch or even a small section of the wall to see how the color behaves in your light. And don’t forget about your flooring and furniture—Charcoal Slate can look different next to warm oak versus cool tile, so make sure it harmonizes with your existing elements.

In the end, Charcoal Slate is more than just paint—it’s a design tool. It’s for anyone who wants a space that feels intentional, stylish, and uniquely theirs. Whether you’re going for moody and dramatic or soft and sophisticated, this color delivers. So grab a brush, trust your instincts, and let this rich, nuanced gray transform your home into something extraordinary.

Real Room Photo of Charcoal Slate HC-178

Undertones of  Charcoal Slate ?

The undertones of Charcoal Slate are a key aspect of its character, leaning towards Blue. These subtle underlying hues are what give the color its depth and complexity. For example, a gray with a blue undertone will feel cooler and more modern, while one with a brown undertone will feel warmer and more traditional. It’s essential to test this paint in your home and observe it next to your existing furniture, flooring, and decor to see how these undertones interact and reveal themselves throughout the day.

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HEX value: #646769

RGB code: 100, 103, 105

Is  Charcoal Slate Cool or Warm?

While primarily a cool gray, Charcoal Slate’s undertones create a balanced effect that can feel warm in certain settings. This characteristic allows it to harmoniously blend with both warm and cool decor, providing flexibility in design choices.

Understanding Color Properties and Interior Design Tips

Hue refers to a specific position on the color wheel, measured in degrees from 0 to 360. Each degree represents a different pure color:

• 0° represents red
• 120° represents green
• 240° represents blue

Saturation describes the intensity or purity of a color and is expressed as a percentage:

• At 0%, the color appears completely desaturated—essentially a shade of gray
• At 100%, the color is at its most vivid and vibrant

Lightness indicates how light or dark a color is, also expressed as a percentage:

• 0% lightness results in black
• 100% lightness results in white

Using Warm Colors in Interior Design

Warm hues—such as reds, oranges, yellows, warm beiges, and greiges—are excellent choices for creating inviting and energetic spaces. These colors are particularly well-suited for:

• Kitchens, living rooms, and bathrooms, where warmth enhances comfort and sociability
• Large rooms, where warm tones can help reduce the sense of emptiness and make the space feel more intimate

For example:

• Warm beige shades provide a cozy, inviting atmosphere, ideal for living rooms, bedrooms, and hallways.
• Warm greige (a mix of beige and gray) offers the warmth of beige with the modern appeal of gray, making it a versatile backdrop for dining areas, bedrooms, and living spaces.

However, be mindful when using warm light tones in rooms with limited natural light. These shades may appear muted or even take on an unpleasant yellowish tint. To avoid a dull or flat appearance:

• Add depth by incorporating richer tones like deep greens, charcoal, or chocolate brown
• Use textured elements such as curtains, rugs, or cushions to bring dimension to the space

Pro Tip: Achieving Harmony with Warm and Cool Color Balance

To create a well-balanced and visually interesting interior, mix warm and cool tones strategically. This contrast adds depth and harmony to your design.

• If your walls feature warm hues, introduce cool-colored accents such as blue or green furniture, artwork, or accessories to create contrast.
• For a polished look, consider using a complementary color scheme, which pairs colors opposite each other on the color wheel (e.g., red with green, orange with blue).

This thoughtful mix not only enhances visual appeal but also creates a space that feels both dynamic and cohesive.

Light Temperature Affects on Charcoal Slate

Natural Light

Natural daylight changes in color temperature as the sun moves across the sky. At sunrise and sunset, the light tends to have a warm, golden tone with a color temperature around 2000 Kelvin (K). As the day progresses and the sun rises higher, the light becomes cooler and more neutral. Around midday, especially when the sky is clear, natural light typically reaches its peak brightness and shifts to a cooler tone, ranging from 5500 to 6500 Kelvin. This midday light is close to what we perceive as pure white or daylight-balanced light.

These shifts in natural light can significantly influence how colors appear in a space, which is why designers often consider both the time of day and the orientation of windows when planning interior color schemes.

Artificial Light

When choosing artificial lighting, pay close attention to the color temperature, measured in Kelvin (K). This determines how warm or cool the light will appear. Lower temperatures, around 2700K, give off a warm, yellow glow often used in living rooms or bedrooms. Higher temperatures, above 5000K, create a cool, bluish light similar to daylight, commonly used in kitchens, offices, or task areas.

Use the slider to see how lighting temperature can affect the appearance of a surface or color throughout a space.

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LRV of Charcoal Slate

The Light Reflectance Value (LRV) of Charcoal Slate is 14.51%, which places it in the Medium Dark category. This means it reflects very little light. Understanding a paint’s LRV is crucial for predicting how it will look in your space. A higher LRV indicates a lighter color that reflects more light, making rooms feel larger and brighter. A lower LRV signifies a darker color that absorbs more light, creating a cozier, more intimate atmosphere. Always consider the natural and artificial lighting in your room when selecting a paint color based on its LRV.

Detailed Review of  Charcoal Slate

Charcoal Slate is a standout choice for those looking to create a sophisticated atmosphere in their home. The unique blend of gray with subtle green undertones gives it a versatile character that works well in various lighting conditions. Whether you’re using it in a cozy living room or a stylish home office, this color brings a calm yet elegant vibe. One of the highlights of Charcoal Slate is its ability to pair beautifully with both warm and cool accents, allowing for an array of decor options. Users appreciate its ability to transform spaces without feeling too dark or heavy, making it a fantastic choice for open-concept areas or smaller rooms.

Pros & Cons of  HC-178 Charcoal Slate

Colors that go with Benjamin Moore Charcoal Slate

FAQ on HC-178 Charcoal Slate

Can I use Charcoal Slate in a small room?

Absolutely! While Charcoal Slate can appear darker in smaller spaces, its unique undertones can add depth and character. To make the most of it, ensure adequate lighting and pair it with lighter furnishings or accents to balance the overall look.

What type of finish should I choose for Charcoal Slate?

Choosing the right finish depends on the room’s purpose. For walls in living spaces, an eggshell or satin finish offers a nice blend of durability and aesthetic appeal. If you’re painting ceilings or more casual areas, a matte finish can create a softer look.

Comparisons Charcoal Slate with other colors

Official Page of Benjamin Moore Charcoal Slate HC-178