I did give a very pathetic answer to this question earlier didn’t I! I’m glad you asked it again! I’ve had to do a bit of research since I last answered this question and this is what i founf out:
A mirror is actually colourless.
Most things have color because when light hits them, some colors bounce off and others are absorbed and we only see the ones that bounce off.
A mirror is a little different in that all light bounces off of it.
But a mirror is a little sepcial. Normally, an object that all light bounces off is white, because when all different colors of light mix together it makes white. But a mirror is so smooth that the light stays organized instead of mixing together, so the colors stay separate and you see a reflection.
So the answer I guess is colourless or it depends on what is being reflected!!