Autoclaving sterilises, but ultrasonic cleaning is what makes sterilisation possible. This is the physics of cavitation, the frequency and solution choices, and the validation that proves your instruments are actually clean.

Read the full article: Ultrasonic Cleaning Science: Cavitation, Validation and Protocols for Body Art Instruments

From Poli International, body art material science and safety. poliinternational.com

UV tattoo ink uses phosphorescent compounds, not standard pigments, and its safety profile is less studied. Here is the chemistry, the known risks, the regulatory status and what the published evidence actually says.

Read the full article: Is UV Tattoo Ink Safe? What the Evidence Shows

From Poli International, body art material science and safety. poliinternational.com

Every guide tells you to avoid externally threaded jewellery. Almost none tells you how to choose between the options that are left, even though they hold together by completely different physics: one is a machined screw thread, the other is a bent pin held by tension the piercer sets by hand.

Read the full article: Internally threaded or threadless? The choice nobody explains, because both answers are correct

From Poli International, body art material science and safety. poliinternational.com

Ten people caught Pseudomonas perichondritis from one piercing studio. The bacteria were not on the needles or the jewellery. They were in the hand wash sink, the tap water and the point-of-use water heater, and genetic typing proved it.

Read the full article: The studio tap that infected ten ears: what the UK Pseudomonas outbreak means for your water supply

From Poli International, body art material science and safety. poliinternational.com

There are three ways to connect a piece of body jewellery, not two. I created the third one in the early 2000s, for BioFlex, after seeing too many piercings torn open by jewellery that would not let go. Here is how it works, what it gives up, and why you have probably never seen it named correctly.

Read the full article: The third system: why I built push-fit, and what it does that a thread cannot

From Poli International, body art material science and safety. poliinternational.com

Tea tree oil has genuine antimicrobial activity, but a healing piercing is not acne. Here is why the most commonly recommended home remedy for piercing bumps does not match the pathology of what most bumps actually are.

Read the full article: Tea Tree Oil on Piercing Bumps: What the Evidence Actually Says

From Poli International, body art material science and safety. poliinternational.com

EU-sold inks fail heavy metal limits four years into REACH Entry 75. A 140,841-participant cancer meta-analysis landed. Red ink allergies remain unchanged.

Read the full article: REACH Tattoo Ink Restrictions: Three Years On, Is Anyone Actually Checking?

From Poli International, body art material science and safety. poliinternational.com

The scab on a healing tattoo is the scaffold your new ink is building itself on. Here is what physically happens when you pull that scaffold away, and the recovery protocol if it has already happened.

Read the full article: Can You Pick Tattoo Scabs? Risks & What to Do

From Poli International, body art material science and safety. poliinternational.com

Scar tissue is not intact skin. It has different collagen architecture, vascularity, and pigment-holding capacity. This guide covers scar types, needle behaviour in altered dermis, and when to proceed versus when to refer.

Read the full article: Tattooing Over Scars and Stretch Marks: Technical and Safety Guide

From Poli International, body art material science and safety. poliinternational.com

Most new piercings go through an irritated, red, crusty phase. Learn the four cardinal signs that separate normal healing and irritation from a genuine infection, how rejection differs from both, and what to do in each case.

Read the full article: Piercing Infection vs Irritation vs Rejection: How to Tell

From Poli International, body art material science and safety. poliinternational.com