Red is such a pretty color, don't you think?
I like that its wavelenght is 625-740 nanometres.
Oh wow! That's a new one for me! How many different shades are there?
I am not sure but red is a primary color.
Yep, along with yellow and blue right?
Yes, the RGB color model is an additive color model.
Don't they use that in old projection tvs to produce the screen images?
I think so, the main purpose of the RGB color model is for the sensing, representaion and display of images in electronic systems.
Cool, cool. So what colors mix with red to make other colors?
I am not sure, but red is a important color in China.