Form vs Cornwall Slate
Form (Jotun) and Cornwall Slate (Sherwin-Williams) come from different manufacturers. Form reads as greige-grey, while Cornwall Slate reads as grey — two distinct hue families, not close cousins. Their light reflectance values are nearly the same — 30 vs 29 — so neither will read significantly brighter or darker than the other. Where Form leans warm, Cornwall Slate reads neutral — a distinction that shifts noticeably depending on the light source and surrounding finishes. ΔE 3.1 means they're clearly different, but not dramatically so — they'd pair well in the same room. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Form vs Cornwall Slate in Real Spaces
4 real rooms side by side. Form and Cornwall Slate are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Living Room
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. Form brings more warmth to the space, while Cornwall Slate keeps things cooler and crisper.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. Cornwall Slate reads more restrained here, while Form adds a sense of enclosure and warmth.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. Cornwall Slate reads more restrained here, while Form adds a sense of enclosure and warmth.
Kitchen Cabinets
Cabinet color is always seen in context — against countertops, backsplash, and hardware — which amplifies undertone differences that might disappear on a plain wall. Cornwall Slate reads more restrained here, while Form adds a sense of enclosure and warmth.
Color Details
Form vs Cornwall Slate Simulated Comparison
5 simulated room previews — drag the slider on each to see Form on one side and Cornwall Slate on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Form comparisons
See how Form stacks up against other well-photographed colors across different brands and tones.
