Rock Salt is a Dulux green-grey with a clean, cool cast, and the trick is to lean into that coolness rather than fight it. The moment you warm it up with brass, oak or anything yellow-toned, you muddy the crispness and it starts to look flat. Keep the whole envelope cool and it sings.
For a calm, tonal scheme, sit it alongside Paint & Paper Library Slate IV (LRV 67.5). It's a soft, light cool grey that gives Rock Salt room to breathe — lovely for trim, ceilings or a paler companion wall in a bathroom or bedroom.
When you want depth and a proper anchor, reach for Dulux Sapphire Springs 1 (LRV 6.4). That's an inky, near-black blue — perfect on a vanity, a feature door or joinery, where it grounds the scheme without introducing any warmth. The contrast is dramatic but stays in the same cool family, so it never jars.
For a touch of organic interest, Mylands Artichoke BH.13 (LRV 27.6) is a clever pick. It's a muted, mid green-grey that picks up the green undertone in Rock Salt and adds a more natural, earthy layer — good for a panelled lower wall or a smaller adjoining room.
The "but what about warmth" question is the one everyone asks. You *can* introduce a warm accent — a tan leather chair, a touch of terracotta in textiles — but keep it minimal and incidental. Let it be 10% of the room, not the second colour on the wall. Push past that and the green-grey crispness collapses.
For materials: polished nickel taps, Carrara or honed marble, pale ash or limed oak. Avoid brushed brass and warm timbers like walnut — they pull against everything Rock Salt is doing.
Practical tip: always test Rock Salt on the actual wall in both morning and evening light. Cool greens shift more than you'd expect between a north-facing grey day and warm artificial light, and you want to be sure it stays crisp rather than turning slightly clinical.