The Science
WHAT TATTOO INKis actually made of
Tattoo ink has two fundamental components: a pigment (which provides the color) and a carrier solution (which delivers the pigment into the skin). Beyond these two elements, most commercial inks contain a range of additional additives — some disclosed on the label, some not.
The Carrier Solution
The carrier is the liquid that suspends the pigment and allows it to flow from the needle into the dermis. According to research published in Analytical Chemistry (NIH/PubMed, 2024), carrier solutions in commercially available US tattoo inks consistently contain water and either ethanol and/or isopropyl alcohol. Many also include glycerin (which adjusts viscosity and keeps the solution smooth), witch hazel (an astringent), and propylene glycol. The carrier's job is purely mechanical — it delivers the pigment, then the body processes it out.
The Pigments
Pigment is what stays in your skin permanently. There are two main classes. Inorganic pigments are mineral-based: carbon black (the most common black pigment), titanium dioxide (white, and the second most widely used pigment overall), and iron oxides (browns, yellows, certain reds). These are generally chemically stable once embedded in the dermis. Organic pigments — carbon-based synthetic compounds — dominate the market for bright colors. Azo pigments produce most reds, oranges, and yellows; diarylide pigments are used in some yellows and oranges. Both classes are more chemically reactive than inorganic pigments, particularly under UV exposure.
The Unlisted Additives Problem
A 2024 peer-reviewed study in Analytical Chemistry (published via NIH's National Library of Medicine) analyzed 54 tattoo inks from nine major US brands and found that 45 of the 54 — over 83% — contained unlisted additives and/or pigments. The most common unlisted additives were polyethylene glycol (PEG), propylene glycol, and higher alkanes. This is a significant finding: if an ingredient isn't listed, clients and artists can't make informed decisions about potential reactions. This is part of why the FDA's regulatory involvement — which significantly expanded in 2022 and 2024 — matters for anyone getting tattooed.
For the practical implications of ink safety on your skin, see our tattoo safety guide and aftercare guide. For what Savannah's studios use and how they source their inks, studios like Paris Joelle Tattoos, Drop Dead Tattoo, and Savannah Ink Studio all use reputable, professional-grade ink brands — a meaningful distinction from unvetted sources.
"In their simplest form, tattoo inks are pigments suspended in a carrier of alcohol and water. The complexity — and the risk — comes from what else is in there." — American Chemical Society, C&EN
FDA Regulation & Color Safety
WHAT THE FDA NOWrequires — and what it found
FDA'S 2024 FINAL GUIDANCE — WHAT CHANGED
On October 25, 2024, the U.S. Food and Drug Administration issued final guidance to the tattoo ink industry on preventing microbial contamination — the most significant federal regulatory action on tattoo ink in US history. The guidance was issued under the Modernization of Cosmetics Regulation Act (MoCRA) of 2022, which for the first time gave the FDA authority to recall tattoo inks, require adverse event reporting, and mandate ingredient labeling. Between 2003 and 2024, the FDA documented 18 voluntary recalls of contaminated tattoo inks — all involving microbial contamination in sealed bottles.
RED AND ORANGE INKS CARRY THE HIGHEST REACTION RISK
Red is the color most associated with allergic skin reactions — raised, scaly, or nodular patches that can appear months or even years after the tattoo was done. According to research cited by ScienceInsights (2026), the culprit is usually not the original pigment but its breakdown products: azo pigments (used in most red, orange, and yellow inks) become chemically unstable under UV radiation. This is one of the strongest arguments for sun protection on all healed tattoos. See our aftercare guide for sun protection guidance.
HEAVY METALS: THE HISTORICAL CONCERN
Older tattoo ink formulations used heavy metal-based pigments — cadmium for certain reds and yellows, mercury sulfide (cinnabar) for bright red, lead compounds for various colors. Most of these have been phased out of professional-grade inks in Western markets. Modern regulatory frameworks (including New Zealand's EPA guidelines, which are among the most detailed) set strict maximum limits: 0.5 parts per million for cadmium, 0.7 ppm for lead, and 0.5 ppm for mercury. Choosing professional studios that use vetted ink brands significantly reduces exposure to these compounds.
CARBON BLACK AND PAH CONTAMINATION
Carbon black — the primary pigment in black tattoo ink — can be contaminated with polycyclic aromatic hydrocarbons (PAHs), a class of compounds associated with cancer risk. These are the same compounds found in car exhaust and cigarette smoke. According to reporting by CBS News (citing peer-reviewed research, 2024), the contamination is a known issue in the industry. High-quality professional inks from reputable manufacturers have significantly lower PAH levels than cheaper alternatives.
WHAT HAPPENS TO INK IN THE BODY
Once in the dermis, pigment particles are recognized as foreign matter by the immune system. Macrophages — immune cells — attempt to engulf and remove them, but most particles remain trapped in the dermal layer, which is why the tattoo stays visible. Some nanoscale particles are transported via the lymphatic system to regional lymph nodes; research has documented pigment accumulation in lymph nodes distant from the tattoo site. The long-term implications of this accumulation are still being studied. Choosing an artist who uses professional-grade, tested inks reduces the unknowns.
HOW TO ASK YOUR ARTIST ABOUT INK
You have every right to ask your tattoo artist what ink brands they use and why. Reputable artists at studios like Lusiana Morales or Paris Joelle Tattoos will answer this without hesitation. If an artist can't tell you what ink they use, or deflects the question, that's a meaningful warning sign. Professional-grade inks from established brands — Intenze, Eternal, Dynamic, Radiant — are industry standards for a reason.
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COMMON Questions
Is tattoo ink FDA approved?
No — tattoo inks are not individually FDA approved. However, since the Modernization of Cosmetics Regulation Act (MoCRA) of 2022, the FDA now has authority to recall tattoo inks, require adverse event reporting, and mandate ingredient labeling. The FDA issued final guidance on microbial contamination in October 2024 — the most significant federal action on tattoo ink safety in US history.
What is the safest tattoo ink color?
Black ink (carbon black) is generally considered the most stable and lowest-risk option. Bright colors — particularly red, orange, and yellow — carry higher allergic reaction potential due to azo pigment breakdown under UV exposure. White ink (titanium dioxide) is widely used but has its own stability questions. Whatever color you choose, professional-grade inks from vetted manufacturers are meaningfully safer than cheap alternatives.
Can tattoo ink cause cancer?
Some tattoo ink components — particularly carbon black contaminated with PAHs, and certain azo pigment breakdown products — are classified as potentially carcinogenic by regulatory bodies. The absolute risk from tattoo ink specifically is still being studied. What's clear is that professional-grade inks have lower contamination levels, and that sun protection on tattoos reduces UV-driven pigment breakdown. See our tattoo safety guide for a full discussion.
What should I ask a tattoo artist about their ink?
Ask what brands they use and why. Ask whether they stock inks from established professional manufacturers. Ask how they store their inks (contamination can occur post-opening if storage conditions are poor). A good artist will answer all of this without hesitation — it's part of their professional responsibility to their clients.