# Why does purple = red + blue?

**URL:** <https://boards.straightdope.com/t/why-does-purple-red-blue/467569>\
**Category:** Factual Questions\
**Created:** [October 12, 2008, 6:36am UTC](https://boards.straightdope.com/t/why-does-purple-red-blue/467569 "2008-10-12T06:36:26Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![The\_Flying\_Dutchman](https://avatars.discourse-cdn.com/v4/letter/t/9fc348/32.png) [@The\_Flying\_Dutchman](https://boards.straightdope.com/u/The_Flying_Dutchman)\
**Post date:** [October 30, 2008, 8:13pm UTC](https://boards.straightdope.com/t/why-does-purple-red-blue/467569/21 "2008-10-30T20:13:24Z")

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> [@Malacandra](#):
>
> Yes. Also, **ticker** , what are these \*yellow \*receptors of which you speak? 🙂

He specifically omitted yellow as a receptor earlier in the post.

I’d say he was just typing to fast.

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