While I am sure this is a very good product it is not giving me a dark easily read tattoo. I use it on my rabbits and now with a tattoo clamp, not a pen. The ink we used in the past was a paste and now has been discontinued. I was in hopes that INTENZE would work in it's place. I checked the 3 week old tattoo yesterday and most of those we used with INTENZE are not able to be read and will have to be touched up. I realize tattooing with a clamp is not the way your product was designed to be used. I have not complaints about the product - it was an experiment.