Just a side note here:
pure K as in CMYK black is not actually really pure black. Something closer to real black is what is called “rich black” and is a mixture of all CMYK together… This is all because we are talking about an additive process where inks are added to make colors.
For the purposes of this project you’ll want to work from end to end in RGB where real black is achievable and is the subtraction of every color hence #000000