Most tattoo inks are around 10$ an oz. Unless it's outdated, I wouldn't use that to tag shit lol, huge waste of money. If you have a decent amount, you can sell it to a beginner and buy yourself some real ink or paint for your markers/mops.

 

Didnt think about that. It was basically free and theres alot of it. Some are dried up i guess from caps left open and others are untouched. Thanks.

 

If it's uncut black ink then depending on the brand it might be good for tagging, Dynamic Black a popular tattoo ink is some of the strongest color fast pigment you can get and would probably be excellent for tagging but kind of expensive. There are probably some people who still tattoo with Pelikan Drawing ink.. it's good for shading.

Colored ink might tend to have some proprietary ingredients like gylcerin or witch Hazel added to it.

 

As I'm seeing that bottle of dynamic ink, if you bought your ink on Amazon or eBay it's probably fake Chinese version so yeah go ahead and use that, mix it up