There really is no difference. Maybe different brands made them. But Land-o-Lakes does make both blue and red caps...
The differences between red and blue light are Red stands for n00b and blue stands for b00b! your mum
the color
red has a lower frequency and a longer wavelength than blue
blue and white stars are hotter than red stars (and newer).
The only difference is the colour of the external shell.
Simple one is a black-red star and the other is black-blue star. The only difference is the color.
The difference is in the size of the wavelength blue is smaller than red.
Blue is a primary color. Blue and red mix to make purple, which is a secondary color.
they are all different colours
Wall thickness
biggest difference is that in light- the primary colors are red blue and green. Whereas in paint pigments its red blue and yellow
Wavelength Frequency and Photon Energy