Hi Nick,
The permanent SMP treatments all use traditional tattoo ink, this is the only product that can remain visible after many years but this comes with a BIG disadvantage. If you think of old tattoos you can see that they start to blur and turn lightly blue-ish.
In SMP this can mean that the dots will expand and start to connect leaving a shade of grey-blue, this will not look natural after a few years.
The most natural looking solution is to opt for semi-permanent. These treatments are carried out using pigments rather than inks but not all of them are very good. I understand it can be very difficult to find the right technician and how to know what products and techniques they use.
Pigmentalia (partners of Milena Lardi) use pigments which will fade within 2 years. Allthough this might not sound ideal, we feel its the only to avoid risking big blue dots in the future and also with yearly touch-ups we can keep the result looking fresh and natural.
Hope this info helps, feel free to message me any time if you want more information about SMP in general.
Kind Regards,
Jasper Scholtes