system
Given the following post, respond as if you're commenting on Reddit:
human
If silica aerogel looks blue due to Rayleigh Scattering, would making a much larger block of it make it go red?

So from my understanding of Rayligh Scattering, the photons of the shorter wavelengths (blue) get scattered preferentially to those of the longer wavelengths. But if you lengthen the photon path length eventually those longer wavelengths would be scattered, like at sunset.

So would this work for bigger blocks of silica aerogel?
gpt
No, the aerogel should still look blue.  If you shine a beam of white light through it onto a screen, the color on the screen may get more red.

Raleigh scattering is splitting the blue light from the other colors.  The sun is white - but scattering off a little of the blue light (to light up the sky) leaves the rest of the direct light looking yellow to us.  Scattering more of the light off, means that the remaining light is (proportionally) more red.

Water is also blue due to scattering, but if you look at deeper or larger bodies of water, they don't look more red - only more blue.