A dark thingy

What used to be esoteric science a couple of decades ago, ends up as popular science through movies and YouTube shorts. Blackholes fall in that category which went from nerd to pop.

Me: What's your favourite colour?

(Expecting anything from the primary colours or at least vibgyor range, to help me choose a gift)

4yo: Dark Black !

I can still buy an Ordinary-Black gift, but for anything darker, he needs to seek it at the centre of our galaxy.