Related Clues:

• Rust producer
• Rust-causing agent
• Perhaps I'd no tax for this agent
• It gives a brown coat to animal, fish and insect
• It causes rust
• Neat Italian fellow admitted it produces rust
• Harmful chemical found in food and dissolved in neat vermouth
• Producer of reddish coat in the West, say
• Something causing rust, for instance
• A provider of oxygen in a chemical reaction
• The West heard of this chemical agent
• Agent causing, eg, rust
• Something creating rust
• Such as hydrogen peroxide or ozone
• Chemical found in box I'd anticipated