The immune system recognises allergens by chemical shape, not marketing label. A nickel allergy predicts reactions to cobalt and palladium. Latex allergy cross-reacts with banana, avocado, and kiwi. Red tattoo pigment sensitivity extends to orange and magenta. This reference maps the cross-reactivity patterns that determine what materials are actually safe.
What the full article covers
Nickel allergy predicts co-sensitisation to cobalt and palladium. A nickel-sensitive client given palladium-white-gold jewellery may react because the immune system recognises the similar molecular geometry, not the metal name.
Latex allergy cross-reacts with banana, avocado, kiwi, and chestnut through latex-fruit syndrome. A client who reports oral itching after eating these foods should be screened for latex allergy before latex gloves are used.
Red tattoo pigment reactions are the most common allergic tattoo complication. Cross-reactivity extends to orange and magenta pigments that share naphthol, quinacridone, or diarylide chemistry.
"Hypoallergenic" is an unregulated claim. "Nickel-free" does not mean cobalt-free or palladium-free. Implant-grade titanium (ASTM F136) and pure niobium are the only reliably cross-reactivity-free metals for fresh piercings.
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First published on poliinternational.com. This is a summary of the original engineering article.
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