Imperial Purple by Johnstone's is a deep muted blue. Hex: #42446E. RGB: 66, 68, 110. Price: approximately £13.37 per litre. The nearest equivalent from another manufacturer is Zoffany Lazuli (ΔE 2.6, “near-identical”), priced at approximately £23.20 per litre. Other close alternatives include Farrow & Ball Blue Maize (ΔE 3.4) and Dulux Amethyst Falls 2 (ΔE 3.7).

Imperial Purple by Johnstone's

Hex: #42446E
RGB: 66, 68, 110
Manufacturer: Johnstone's
Price per litre: £13.37
Price per m² (?): £2.23

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Nearest matches & alternatives from other brands

Colour	Manufacturer	ΔE	Match quality	Price/L	Price/m² (?)
Lazuli (No.ZOP1073)	Zoffany	2.6	Near-identical	£23.20 (£9.83 more)	—
Blue Maize	Farrow & Ball	3.4	Very close	£26.40 (£13.03 more)	£4.06
Amethyst Falls 2	Dulux	3.7	Very close	£14.40 (£1.03 more)	£2.22
Martian Skies 1	Dulux	3.7	Very close	£14.40 (£1.03 more)	£2.22
Regal Purple	Dulux	3.8	Very close	£14.40 (£1.03 more)	£2.22
Purple Infusion 1	Dulux	3.8	Very close	£14.40 (£1.03 more)	£2.22
Plush Velvet 1	Dulux	4.0	Very close	£14.40 (£1.03 more)	£2.22
Indigo Night	Dulux	4.0	Very close	£14.40 (£1.03 more)	£2.22
Purple Polka 1	Dulux	4.8	Very close	£14.40 (£1.03 more)	£2.22