Red is such a passionate, vibrant color
It really is!  My kitchen is actually red - it's at the end of the visible spectrum of light next to orange and opposite violet.
It has the longest wavelength from what I can remember!
It does - you are smart!  The wavelength is 625-740 nanometres!
That's long, I guess! I know that violet has short wavelengths.
Yep - approximately 380-450 nanometers.  Red has so many variations also, from yellow tinged to bluish-red to red pink and even burgunday.
Hair coloring
I think red hair is the prettiest hair shade ever honestly. And red is even used in ceremonies for Ancient Egyptians and Mayans
Red
Yes, even Roman generals even colored their bodies in red to celebrate victories!