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When you run electricity through titanium, it gets colored.

2025/11/13 Edited to

... Read more「チタンに電気を流すと色がつく」って聞くと、最初は塗料で染めているのかな?と思いがちですが、実はチタンの表面で起きる“光の見え方”の変化なんです。チタンを陽極酸化すると、表面にできる酸化膜(TiO2)の厚みが少しずつ変わり、その膜で光が干渉して青・紫・金・緑みたいな色が見えるようになります。だから、色がどんどん変わるのが不思議で、見ているだけでも楽しい金属です。 私がアクセサリー制作で面白いと感じるのは、同じチタンでも電圧(条件)によって出やすい色味が変わるところ。いわゆる“チタンの発色”は、顔料やメッキで「塗る」のではなく「表面の状態をコントロールする」イメージに近いです。そのため、光の当たり方で色の見え方が揺らいだり、角度で表情が変わったりします。写真だと伝えきれない立体的なきらめきが出るので、リングなど身につけると特に実感しやすいです。 気になる方が多いポイントとしては「色は落ちるの?」という点。陽極酸化は塗装ではないので、通常使用で簡単にベロッと剥がれるというより、表面の摩耗で少しずつ変化する可能性がある、という理解が近いと思います。特に指輪は日常で擦れやすいので、着けっぱなし派の方は家事や作業のときだけ外す、保管時に他の金属と擦れないようにする、などを意識すると発色がきれいに楽しめます。 もうひとつ、検索でよく見かけるのが「金属アレルギーでも大丈夫?」という疑問。チタンは比較的アレルギーが起きにくい素材として知られていて、金属アレルギー対応アクセサリーとして選ばれることも多いです。ただし体質や状況は人それぞれなので、不安がある場合は短時間から試す、肌トラブルが出たら使用を中止する、というスタンスが安心です。 チタンの陽極酸化は、理屈を知るとさらに面白くなります。色がどんどん変わる不思議な金属だからこそ、シンプルな形でも存在感が出やすいのが魅力。発色の雰囲気やデザインの違いは好みが分かれるので、いろいろ見比べて「この色の出方が好き」と思える一本を探すのがおすすめです。

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