Mountain Slate Blue 10BB 18/106 is a gray paint color from PPG. It has a hex value of #687788, estimated LRV 18 and a neutral undertone. Its closest cross-brand match is Always Indigo from Behr (nearly identical), with 49 more equivalents across other brands.
PPG · #687788 · 10BB 18/106
Mountain Slate Blue
18%Estimated LRV
NeutralUndertone
Mountain Slate Blue Technical Profile
HEX Code#687788
RGB104, 119, 136
Estimated LRV17.9
UndertoneNeutral
Digital swatches and calculated matches are approximations. Catalog LRV values may be calculated estimates, not manufacturer measurements. Data and matching method. Check the brand reference and physical samples before purchase.
Color Familygray
BrandPPG
Test it in your room
Place physical samples beside your flooring and trim. Check them in daylight and with your evening lights before buying paint.
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Compare alternatives to Mountain Slate Blue
Digital candidates from other paint brands, ranked by color similarity. Always verify with a physical sample. How we calculate match accuracy →
Always Indigo
Behr
#66778C
Close digital match
Thundering Clouds
Valspar
#66778D
Close digital match
Wharf View
Dunn-Edwards
#65737E
Similar digital color
Distance
Sherwin-Williams
#5D6F7F
Similar digital color
Blue Depths
Hirshfield's
#5A7187
Similar digital color
Britannia Blue
Benjamin Moore
#68747D
Similar digital color
Blue Depths
Vista Paint
#596F85
Similar digital color
Flint Stone
Dutch Boy
#5C6E7C
Similar digital color
North Beach Blue
Kilz
#70839A
Visible digital difference
Pigeon Blue
RAL
#606E8C
Visible digital difference
Wine Dark
Farrow & Ball
#5C6576
Visible digital difference
Comparing these brands? Order peel-and-stick samples of your top matches — Samplize buy 8 peel-and-stick samples, get 2 free.
Generated palette previews
Colors That Work With Mountain Slate Blue
These are generated digital colors, not named manufacturer paints. Use the palette tools to find paint candidates, then compare physical samples.
Timeless pairing with clean white trim and a tonal accent wall
Side Walls
Mountain Slate Blue
#687788
Accent Wall
Tonal Shift
A warm shift that adds depth without clashing.
#7D7CA7
Trim & Molding
Digital white
Crisp white trim for a clean, traditional look.
#FFFFFF
Color Palettes for Mountain Slate Blue
Color harmonies based on color theory — each swatch links to the closest matching paint.
Opposite on the color wheel — creates vibrant contrast
Mountain Slate Blue Room Palettes
Color schemes built around this color — each swatch links to the closest matching paint.
Warm & Inviting
Warm tones with cozy appeal — welcoming and comfortable
Cool & Calm
Cool hues with soft contrast — serene and restful
Bold Contrast
Complementary hues with punch — dynamic and striking
Similar PPG Colors
Other PPG colors close to Mountain Slate Blue.
More gray colors from other brands
Cross-brand colors in the gray family — useful when you want a similar look from a different brand.
Mountain Slate Blue — Frequently Asked Questions
What undertone does Mountain Slate Blue have?
Mountain Slate Blue by PPG has a neutral undertone and sits in the gray color family. This is a digital classification, not a prediction of physical paint under every light. Compare samples in your own space.
What colors match Mountain Slate Blue from other brands?
The closest cross-brand equivalents to Mountain Slate Blue are Always Indigo by Behr (a close digital match), Hypnotic by Behr (a close digital match), Thundering Clouds by Valspar (a close digital match) — the best options for getting Mountain Slate Blue's look from a brand your local store carries. Confirm with a physical sample, since sheen and lighting shift the final result.
What is the LRV of Mountain Slate Blue?
Mountain Slate Blue has a estimated lightness value of 17.9, on a scale where 0 is pure black and 100 is pure white — that makes it a deep, dramatic color best saved for accent walls, dining rooms, and cozy spaces where atmosphere matters more than reflected light.
Explore More with Mountain Slate Blue
Related Reading
How to Match Paint Colors Across Brands
The science behind Delta E and CIEDE2000 — find a Behr equivalent of any Sherwin-Williams shade, or a Benjamin Moore alternative when your store is out of stock.
Understanding Paint Color Undertones
Why Mountain Slate Blue's neutral undertone matters more than its surface color — and how to read undertones in any paint chip.