What color do blue and grey make?
Blue and Grey make slate grey.
Blue and Grey make slate grey, #556d86. That is the result in equal parts, mixing pigment rather than light - paint, ink and dye all behave this way.
Equal parts blue and grey · #556d86
Change the ratio
Very little of a mix is ever half and half. Shifting the balance moves the result along the range between the two colours.
3 parts blue, 1 part grey · #466a92
Equal parts · #556d86
1 part blue, 3 parts grey · #596674
Lighter and darker
With white added - a tint · #a2acb8
With black added - a shade · #263648
Why it works
Pigment mixes subtractively: blue paint absorbs the wavelengths it is not reflecting, grey absorbs its own set, and slate grey is what neither of them absorbed. This is why paint behaves differently from a screen, where light adds together instead.
Frequently asked questions
What color do blue and grey make?
Blue and Grey make slate grey, #556d86. Mixed in equal parts that is the result you get with paint, ink or any other pigment.
How do I make the result lighter or darker?
Add white for a tint - here that gives light grey. Add black for a shade, which gives navy. Add white a little at a time, because it takes far less than people expect to shift a mix.
What happens if I use more blue than grey?
Three parts blue to one part grey gives slate grey. Reversing it to one part blue and three parts grey gives slate grey instead.
Does this work the same way on a screen?
No. Screens mix light additively, so red and green light make yellow there. These results are subtractive - paint, ink, dye and pigment - which is what people mean when they ask what two colours make.