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

<p><a href="https://i.sstatic.net/wAK4f.jpg" rel="noreferrer"><img src="https://i.sstatic.net/wAK4f.jpg" alt="enter image description here"></a></p>

<p>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:  </p>

<p><a href="https://i.sstatic.net/n6GYf.jpg" rel="noreferrer"><img src="https://i.sstatic.net/n6GYf.jpg" alt="enter image description here"></a>  </p>

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

CC BY-SA 4.0
2019-07-31T16:30:18.673Z
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
CC BY-SA 4.0
2019-07-31T23:48:44.693Z
@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
CC BY-SA 4.0
2019-08-02T20:38:42.083Z
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
CC BY-SA 4.0
2019-08-11T17:49:23.793Z
@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
CC BY-SA 4.0
2019-07-31T04:58:06.297Z
2019-08-01T02:17:29.573Z
2019-08-01T02:17:29.573Z
JohnnyB
<p>Blue on the left, unknown in the middle, dark turquoise on the right.</p>

<p>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.</p>

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

<p><a href="https://i.sstatic.net/ZajEj.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/ZajEj.jpg" alt="enter image description here"></a></p>

<part-identification><colour>
What's this Colour?
Zach Turley
# What's this Colour?

(Asked by: username_0 on 2019-07-31)

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

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.

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

[![enter image description here](https://i.sstatic.net/ZajEj.jpg)](https://i.sstatic.net/ZajEj.jpg)

**Tags:** part-identification, colour


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## 1 answers

### Answer by username_1 on 2019-07-31. Score: 6 | Accepted answer

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

[![enter image description here](https://i.sstatic.net/wAK4f.jpg)](https://i.sstatic.net/wAK4f.jpg)

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](https://i.sstatic.net/n6GYf.jpg)](https://i.sstatic.net/n6GYf.jpg)

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

> **Comments:**
> **username_0**: 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.  
> **username_1**: @username_0 - 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.  
> **username_2**: 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.  
> **username_0**: @username_1 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.  

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