Gold Sodium Thiosulfate
The patch-test marker for gold allergy — and why a reaction to "gold" jewellery is often really the nickel in the alloy
INCIGold Sodium Thiosulfate
- Category
- Metal
- Risk level
- medium
- More common than expected
- Gold allergy turns up in roughly 8–15% of patch-tested patients in some series — sometimes above nickel
- Gold or the alloy?
- Lower-karat gold (9K–18K) contains nickel, copper and other metals — a "gold" reaction can really be nickel allergy; 24K pure gold rarely reacts
- Slow to show
- Gold reactions can develop slowly and even appear at sites away from the jewellery, which makes them easy to misread
- Marker only
- Gold sodium thiosulfate is the diagnostic patch-test agent — it isn't the form found in jewellery or cosmetics
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This ingredient may appear under any of these names:
Commonly found in
Possible reactions
- Dermatitis at jewellery-contact sites (earlobes, neck, fingers)
- Earlobe dermatitis from gold earrings
- Eyelid/facial dermatitis (gold can produce reactions at distant sites)
- Oral reactions near gold dental work (rare)
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What is gold sodium thiosulfate?
Gold sodium thiosulfate (sodium aurothiosulfate; "gold thiosulfate") is a water-soluble gold salt used as the standardised patch-test antigen for gold contact allergy. It isn't something you'll find in jewellery or cosmetics — its job is purely diagnostic: to reveal whether your immune system is sensitised to gold.
Gold the metal is the actual allergen of interest. It's used in jewellery, dental restorations, some medical devices, and occasionally as a decorative or "bioactive" ingredient in luxury cosmetics. And gold allergy is more common than people assume — some patch-test series put it at 8–15%, occasionally above nickel — though its clinical relevance can be tricky to pin down because reactions develop slowly and sometimes appear at sites away from the jewellery.
Why gold causes reactions
Gold is chemically noble and barely soluble, but sweat and body fluids can slowly release gold ions, which bind skin proteins and drive Type IV delayed hypersensitivity. Several practical points shape the picture:
- Karat matters. 24K (pure) gold is least reactive. Lower-karat gold (9K, 14K, 18K) is alloyed with nickel, copper, silver or palladium — some of which are strong sensitisers in their own right.
- A "gold" reaction may be nickel. Earlobe dermatitis from gold earrings is frequently the nickel in the alloy, not the gold.
- Wear time and area count. Continuously worn items (earrings, rings) give the most ion exposure.
- It can show at a distance. Gold reactions sometimes appear on the eyelids/face, not just at the jewellery site.
"Gold allergy" is one of the most misattributed reactions I come across. People conclude they're allergic to gold when the real offender is the nickel hiding in a 14K alloy — and that distinction completely changes what they can safely wear. The fix isn''t guessing from how shiny the metal looks; it''s testing gold and nickel separately. — Snehal
Where gold is found
- Jewellery — earrings, necklaces, rings, bracelets (9K–24K).
- Gold-plated items — watch cases, fashion jewellery over base metal.
- Dental restorations — gold crowns, bridges, inlays (less common now).
- Luxury cosmetics — gold-particle masks, serums, highlighters; "gold facial" treatments.
On cosmetic labels: Gold or Colloidal Gold. (Gold sodium thiosulfate appears only in patch-test kits.) On jewellery, check the karat hallmark.
Safer alternatives
- Platinum or titanium — usually well tolerated for confirmed gold allergy.
- 316L surgical stainless steel earrings — minimal nickel release, good for earlobe reactions.
- High-karat (22K–24K) gold — lower alloy content if the reaction is alloy-driven (confirm with a clinician).
- Gold-free cosmetics — skip gold-particle skincare if gold allergy is confirmed.
The bottom line
Gold sodium thiosulfate is the patch-test marker that confirms gold contact allergy — a more common metal allergy than people expect, classically presenting as earlobe or jewellery-site dermatitis. But the crucial question a positive raises is gold, or the alloy? Because lower-karat gold hides nickel and copper, testing gold and nickel separately is what tells you whether to reach for higher-karat gold, switch to platinum/titanium, or avoid gold altogether.
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