<blockquote>
  <p>Going for contrast to help you build?</p>
</blockquote>

<p>This is probably the primary reason most of the time.</p>

<p><a href="https://www.eurobricks.com/forum/index.php?/forums/topic/40452-different-colours-on-the-inside-of-models/&amp;tab=comments#comment-714122" rel="noreferrer">One Eurobricks user once said</a> they asked a set designer about it, and they confirmed they do it to makes it easier to follow the instructions:</p>

<blockquote>
  <p>I had an opportunity some time ago to talk to a designer at TLG, and he told me that they use other colors to make it easier to follow the instructions and build the model.</p>
</blockquote>

CC BY-SA 3.0
2017-09-07T04:59:40.410Z
2017-09-07T04:59:40.410Z
Alexander O'Mara
<p>While building many LEGO sets I have noticed that for internal pieces you cannot see when the set is finished; LEGO often chooses mis-matching colors.  For instance in the (amazing) Saturn 5 set most of the pieces are of the white, black, gray family.  However there are some green/blue internal pieces.  Doesn't match the rocket at all.  I have noticed the same thing with other sets as well where a random green internal pieces will show up.</p>

<p>Do they do this for a reason?  Are they using colors that don't sell well and trying to get rid of them?  Going for contrast to help you build?</p>

CC BY-SA 4.0
2020-03-23T14:28:50.740Z
https://bricks.stackexchange.com/questions/2895/why-do-some-sets-contain-parts-of-an-unrelated-colour-that-are-hidden-on-the-fin
htmlcoderexe
CC BY-SA 4.0
2020-04-17T10:00:25.910Z
Does this answer your question? [Why do some sets contain parts of an unrelated colour that are hidden on the final model?](https://bricks.stackexchange.com/questions/2895/why-do-some-sets-contain-parts-of-an-unrelated-colour-that-are-hidden-on-the-fin)
Ilmari Karonen
<design><colour>
How does LEGO decide the color of internal set pieces?
zgirod
# How does LEGO decide the color of internal set pieces?

(Asked by: username_0 on 2017-09-07)

While building many LEGO sets I have noticed that for internal pieces you cannot see when the set is finished; LEGO often chooses mis-matching colors. For instance in the (amazing) Saturn 5 set most of the pieces are of the white, black, gray family. However there are some green/blue internal pieces. Doesn't match the rocket at all. I have noticed the same thing with other sets as well where a random green internal pieces will show up.

Do they do this for a reason? Are they using colors that don't sell well and trying to get rid of them? Going for contrast to help you build?

**Tags:** design, colour

> **Comments:**
> **username_1**: https://bricks.stackexchange.com/questions/2895/why-do-some-sets-contain-parts-of-an-unrelated-colour-that-are-hidden-on-the-fin  
> **username_2**: Does this answer your question? [Why do some sets contain parts of an unrelated colour that are hidden on the final model?](https://bricks.stackexchange.com/questions/2895/why-do-some-sets-contain-parts-of-an-unrelated-colour-that-are-hidden-on-the-fin)  

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## 1 answers

### Answer by username_3 on 2017-09-07. Score: 9 | Accepted answer

> Going for contrast to help you build?

This is probably the primary reason most of the time.

[One Eurobricks user once said](https://www.eurobricks.com/forum/index.php?/forums/topic/40452-different-colours-on-the-inside-of-models/&tab=comments#comment-714122) they asked a set designer about it, and they confirmed they do it to makes it easier to follow the instructions:

> I had an opportunity some time ago to talk to a designer at TLG, and he told me that they use other colors to make it easier to follow the instructions and build the model.


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