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Rainbow dash is cute.

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“Rainbow” is its own color in magical pony world, a magical eighth color outside the normal visual band but appearing as a complete or near-complete rainbow. Dash’s hair is this color; so is the water at Rainbow Falls and whatever was put into those cookies.
 
So, wait… It’s Octarine then? And we just perceive it as a rainbow of color because our brains are not equipped to perceive that color?
Also, all non-spectral colors (such as magenta) don’t actually exist, it’s just a way our brain interprets seeing several lights with different wavelengths simultaneously.
 
well that’s a horribly human-centric way of viewing reality
Background Pony #5424
There’s also impossible colors : combinations of signals where there are no color in real world correspond, such as “redgreen” or “yellowblue”.
 
@Blissey1  
I know about birds and insects. No, I’m saying that correlation between receptors and visual colors isn’t as straightforward as Light makes it sound. Adding fourth receptor in-between blue receptor and red receptor will not make “eight color”.  
P.S. Also, all non-spectral colors (such as magenta) don’t actually exist, it’s just a way our brain interprets seeing several lights with different wavelengths simultaneously.
@Cirrus Light
Nope, another receptor do not make another ‘color’, it just makes distinguish it better. Some girls have mutations with fourth receptor, but it doesn’t make them ‘see’ another color altogether.
 
not quite accurate. Some animals have many more receptors than we do, such as receptors for UV light or infrared. Some, like mantis shrimp, can ever see polarized light! There are most certainly different colors out there that we can’t see.
Background Pony #5424
@Cirrus Light  
Nope, another receptor do not make another ‘color’, it just makes distinguish it better. Some girls have mutations with fourth receptor, but it doesn’t make them ‘see’ another color altogether.
Cirrus Light
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@phallen1  
Fourth color, actually?
 
Human eyes have three receptors: red, green, and blue that interpret light at the long, middle, and short ends, respectively, of the visible range of light as their respective colors.
 
It may actually be possible for ponies to have another color receptor, and when their brain sees that color above a certain threshold, their brain interprets it as “rainbow”.
 
Oh my gosh, thanks so much for this idea! This is awesome! Finally a logical explanation for this!
phallen1
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“Rainbow” is its own color in magical pony world, a magical eighth color outside the normal visual band but appearing as a complete or near-complete rainbow. Dash’s hair is this color; so is the water at Rainbow Falls and whatever was put into those cookies.
Background Pony #5424
So… when single hair is separated, it becomes independently rainbow? Well, considering nature of rainbows, it makes sense.