I use Radiant Colours. They are a thinner ink compared to inks like Eternal and Alla Prima. They do go in really easily though. They also stay really bright. Pretty much what you see when you put it in is what you get. I’ve written a review on them for tattoo radar I’m pretty sure.
Ashta London is very popular among professional artists for their quality tattoo pigments or inks. The pigment provides colour of the tattoo. Ahsta London provide different shades of colour pigments to professional tattoo artists.