Answers.Body: <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>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2017-09-07T04:59:40.410Z
Answers.LastActivityDate: 2017-09-07T04:59:40.410Z
Answers.UserDisplayName: Alexander O'Mara
Body: <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>
  
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-03-23T14:28:50.740Z
Comments.Text: https://bricks.stackexchange.com/questions/2895/why-do-some-sets-contain-parts-of-an-unrelated-colour-that-are-hidden-on-the-fin
Comments.UserDisplayName: htmlcoderexe
Comments.ContentLicense: CC BY-SA 4.0
Comments.CreationDate: 2020-04-17T10:00:25.910Z
Comments.Text: 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)
Comments.UserDisplayName: Ilmari Karonen
Tags: <design><colour>
Title: How does LEGO decide the color of internal set pieces?
UserDisplayName: zgirod
ThreadText: # 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)  
  
  ---
  
  ## 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.
  
  
  ---
  
  