red rust
Refers specifically to the reddish-brown rust that forms on iron or steel.
Red rust had appeared on the old iron bridge.
赤錆を落とすにはサンドペーパーが要る。
You need sandpaper to remove red rust.
Standard kanji spelling.
Mixed kana spelling, common in everyday writing.
Search-only katakana form.
Search-only variant using a rare kanji for rust.
Compound of 赤 (red) and 錆 (rust).