It’s really dark but I really need it gone just for a few hours, everything is smudging or you can still see the tattoo through it. What can I use?

I have been trying to find out what exactly are some of the effects of coloring over color tattoos with straight black ink? Will color still show threw? Lines still show threw? How hard is it to put a large amount of black into your skin? And is there a noticable difference between the un-tattooed skin and the colored skin after black is applied? I know that is probably depends on my tattoo, but I am wondering if any of these questions have some basic answers.

me and my friends are planning on getting a tattoo soon but our parents won’t know. we were planning on using makeup to keep the tats a secret 4 a while. so how soon after gettig our tats will it be ok to cover it with makeup?