luisb

I know there's research being done on fibres deliberately engineered to change colour depending on pH levels to counterbalance the darkness.

For the sweat problem you could have a retroreflective layer on the inside of the fabric :)

Tadashi is awesome! I love his video explaining how someone found a prime that looks like the Arms of Trinity Hall [1]. Highly recommend all videos from Numberphile [2] and Fermat's Library [3].

[1]https://www.youtube.com/watch?v=fQQ8IiTWHhg [2]https://www.youtube.com/channel/UCoxcjq-8xIDTYp3uz647V5A [3]https://www.youtube.com/channel/UCSD2RxaYn2Nxkm41gp-eKfA