its not blacklist and whitelist because "black=bad, white=good", black is the abscense of light, hence the light is blocked, white would obviously be the opposite. So its black because you are blocking things, and white because you aren't.
“Blacklist” and “whitelist” are confusing terms. Why does “black” mean “no”? There are plenty of reasons to use better terms in new projects other than “they upset people” – though that should be a good enough reason on its own.
