Cobalt Stone by Johnstone's is a deep cyan. Hex: #0067A7. RGB: 0, 103, 167. Price: approximately £12.36 per litre. The nearest equivalent from another manufacturer is Dulux Sapphire Springs 3 (ΔE 0.9, “identical”), priced at approximately £10.20 per litre. Other close matches include Dulux Regal Silk (ΔE 1.2) and Dulux Venetian Crystal 3 (ΔE 3.9).

Cobalt Stone by Johnstone's

Hex: #0067A7
RGB: 0, 103, 167
Manufacturer: Johnstone's
Price per litre: £12.36

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Nearest matches from other manufacturers

Colour	Manufacturer	ΔE	Match quality	Price/L
Sapphire Springs 3	Dulux	0.9	Identical	£10.20 (£2.16 less)
Regal Silk	Dulux	1.2	Near-identical	£10.20 (£2.16 less)
Venetian Crystal 3	Dulux	3.9	Very close	£10.20 (£2.16 less)
Atlantic Surf 2	Dulux	4.6	Very close	£10.20 (£2.16 less)
Lost Lake	Dulux	4.6	Very close	£10.20 (£2.16 less)
Atlantic Blue	Dulux	4.8	Very close	£10.20 (£2.16 less)
Royal Regatta 2	Dulux	4.8	Very close	£10.20 (£2.16 less)
Sapphire Springs 2	Dulux	5.5	Similar	£10.20 (£2.16 less)
Royal Regatta 3	Dulux	5.5	Similar	£10.20 (£2.16 less)