Azure Sky 1 vs Celestial Blue 4

Azure Sky 1 and Celestial Blue 4 are both Dulux blues. The gap between them is ΔE 5.1 — “close”. Azure Sky 1 is the lighter of the two, and Celestial Blue 4 the warmer. Both cost about £14.40 per litre.

	Azure Sky 1	Celestial Blue 4
Hex	#0087BD	#1883A7
Lightness (L*)	53	51
Price / litre	£14.40	£14.40

Looking across brands instead? See Azure Sky 1’s cross-brand matches and cheaper alternatives, or Celestial Blue 4’s.