Q: Is the Color Layer Hypoallergenic?

Marlene asked:

I’m desperately trying to find a solution to my recently-developed metal allergy as I LOVE my earrings. Titanium seems like a great option to try, but I am wondering, what is the colored coating composed of? Is there anything in that I could be allergic to?

As I explain on pages such as A short article on the physics of Anodized Titanium Color, the color layer is pure titanium dioxide. Just oxygen bonded to the surface of the metal creating a material that has been used for artificial “Titania” diamonds.

Thus this layer actually is the hypoallergenic coating that makes titanium safe. The “silver” color has a thin layer of the oxide on it, whether I want it or not. Titanium spontaneously grabs oxygen from air or water to protect itself. When anodizing or heat coloring, the higher the voltage, the thicker the protective layer becomes. But there is no practical difference for hardness or sensitivity, as the thickest layer (green) is about 0.00000003 inches thick.

I use a simple phosphate detergent as my electrolyte, then soak the ear hooks in clear water. In the 30 years since I started doing this I have had only two customers who were too sensitive even for titanium wires. I suspect it was a non-chemical tactile or contact sensitivity; the rubbing or pressure itself was causing the reaction.

Some people claim that niobium is even better for sensitive ears than titanium. They are chemically similar, and involve the same method of coloring. It’s been discussed before here: Hypoallergenic: Titanium versus Niobium

I suggest trying both, as a spare pair of wires is cheaper than another shipping charge.  Shop my Ear Hooks.

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