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Blue on the left, unknown in the middle, dark turquoise on the right.

I've tried every possible color on Bricklink and a couple color guides, I'm lost.

enter image description here

Additional detail:

It's got a slightly greener tint than dark blue. Do you know if they change the color over time? It's like this on the entire brick, so I assume it's not faded.

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The color of the 2x4 plate and 1x2 jumpers in the photo appears to be regular Dark Blue:

enter image description here

The greenish tint you mention is likely discoloration. Here is an example of a discolored regular blue piece (right) next to a fairly new regular blue piece (left) for comparison:

enter image description here

How uniform or consistent the discoloraton is depends on the cause and/or whether the piece was assembled when it occurred.

  • I should have included that for comparison, but unfortunately its not. Its got a slightly greener tint than dark blue. Do you know if they change the color over time? Its like this on the entire brick, so I assume its not faded. – Zach Turley Jul 31 at 16:30
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    @Zach Turley - Based on my experience, blues brick of all shades can turn a dingy greenish color with age, sunlight or excessive heat. The shade of green, of course, depends on the shade of blue. I have just recently treated some discolored dark blue bricks (among many others) with hydrogen peroxide, heat and a fluorescent light with very good results. There are a variety of methods using hydrogen peroxide to restore plastic color. A quick Google search will help you find instructions if you're interested. – JohnnyB Jul 31 at 23:48
  • Greenish accent on blue bricks appear due to so called "yellowing" process. It happens a lot with older bricks. So they get more of yellow/brown tint over time. I do believe the color you are looking at is Dark Blue [BL]. It is just bricks got yellowed. – Alex Aug 2 at 20:38
  • @JohnnyB Thank you for the update and great answer. I didn't realize that heat/age would be another factor instead of just sunlight: the bottoms are identical in color to the top, so I believed discoloration was not the case here. – Zach Turley Aug 11 at 17:49

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