Related Clues:

• Water, perhaps, over by fish
• Compound containing oxygen
• Cow-leather emitting hydrogen compound
• Rust or laughing gas, chemically
• Iron __ (rust)
• Chemical making leather without using hydrogen
• Farm animal I'd put on drug, a chemical compound
• Rust, e.g., chemically
• Rust makeup
• "Zinc" or "nitrous" follower
• Compound in hydrogen-depleted animal skin
• Zinc ___ (sunscreen additive)
• Compound with oxygen
• Chemical that removes hard bit from leather
• Iron ___ (rust, e.g.)