I'm looking for long term treatment for my tattoo. I already know that I have to protect it from the sun. What I'm really looking for is information about preserving color although my tattoo is just black ink. I am a black person and I am concerned about maintaining a contrast between my skin color and the color of the tattoo.

So basically I am just looking for any info on preserving the color of my tattoo for example any specific lotions or vitamins that really make the color "pop" and also preserves it.

 Lotion will help it look brighter by keeping the skin moisturized and sunblock to prevent sun damage is about all there is... 

Yeah basically that's it. Anything that keeps your skin healthy will keep your tattoo healthy too.

sway:

Yeah basically that's it. Anything that keeps your skin healthy will keep your tattoo healthy too.

This is what I was going to write. Also, don't be afraid to go for sunscreens with really high SPFs.  I know we colored folks tend to think it's not necessary but it doesn't hurt.

Thank a lot guys....good advice. I love to see healthy skin so I'm always looking for ways to achieve this for myself.

Nothing magical can be done.  Just do what all the others said above. 

 I notice that dry skin really makes a tattoo look dull.  So I use cocoa butter when my skin is dry and I think that really makes my color pop.  That or A&D ointment.

 in addition to the excellent suggestions already made, you could try some gentle exfoliation once in a while, to remove dead skin cells on the top layer of the skin.  

Cloud:

 in addition to the excellent suggestions already made, you could try some gentle exfoliation once in a while, to remove dead skin cells on the top layer of the skin.  

yep, i have to do this sometimes.