Not much depends on the ink "Spaulding and Rodgers" the biggist supplier of Tattoo inks have not changed any of their base colours in over 50 years.
There are a lot of people "some kiwi" that make and claim their inks are better than Spauldings,,most of them are plastic based crap or even mixed with Spaulding inks.
There are around 10 different versions of the basic black,Spauldings is and always has been the best.
Tattooists in the know will buy their inks from Spaulding by batch # and then blend it themselves.
All ink will eventually spread but that's not always due to only the ink it's self.
The skin replaces all it's cells over about a 7 year period,but the ink particules not being cellular is not expelled during that process so it remains but can spread.
It spreads most if it's not placed correctly between the first and second layer of skin,,when it's to deep and under the 3rd layer it's spreads "badly" after about 10 years,often less.
Colour is seldom placed as deep as black,so you get more fading with colour but less spreading.
Most spreading and fading is simply due to the age of the wearer,not the skill level of the tattooist.
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