Monsoon Rust Care: Protecting Your Cast Iron and Carbon Steel Cookware This Season

Dear reader,

Every year, as the monsoon settles in, we get a fair number of messages from customers worried about small orange-brown spots appearing on their tawa or kadai. The good news — this is almost always rust, and rust on cast iron or carbon steel is a care issue, not a defect. It is also completely fixable in a few minutes. Here is how to understand it and stay ahead of it this season.

Why Cast Iron and Carbon Steel Rust in the First Place

Both cast iron and carbon steel are, at their core, iron. Iron reacts with moisture and oxygen in the air to form rust — that is simple chemistry, not a flaw in the cookware. During the monsoon, the air itself carries far more moisture than usual, so a pan that dries perfectly fine in the dry season may stay slightly damp for longer than you realise, especially in the corners near the handle or under the rim.

Your TilCrust™ Layer Is the First Line of Defence

Every Trilonium pan leaves our workshop triple-seasoned with TilCrust™ — our proprietary blend of cold-pressed vegetable oils, cured onto the surface three times. This layer is what keeps moisture from reaching the bare metal underneath in the first place. But as we always tell our customers, TilCrust™ is a living layer, not a permanent factory coating — it can wear thin with harsh scrubbing, very high heat, or acidic food. Wherever the seasoning is thinnest is exactly where rust tends to show up first during a humid month, usually along the edges or in a corner that gets scrubbed a little harder than the rest of the pan.

Spotting Rust vs Normal Seasoning Marks

Do not confuse the two. Normal seasoning looks like an uneven, dark grey-to-black patina — that is simply your pan building character with use, and nothing to worry about. Rust looks distinctly different: small reddish-orange or brownish dots or patches, sometimes slightly rough to the touch. If you see the orange tinge, it is time for a quick fix.

Fixing a Rust Spot, Step by Step

1. Scrub only the affected area with a fine scrubber and a little cooking oil, or a paste of coarse salt and oil, until the orange colour lifts.
2. Rinse quickly with water and a mild dishwashing soap — do not soak the pan.
3. Pat it dry immediately, then place it on the stove on medium flame for a minute or two. This step matters more than people realise — it drives out any last trace of moisture hiding in the pores of the metal, which plain towel-drying cannot do.
4. While the pan is still warm, rub in a thin coat of cooking oil, or a touch of our Trilonium TilCrust™ Beeswax Seasoning Tikki, to rebuild the seasoning over that spot.

Everyday Monsoon Habits That Keep Rust Away

• Always finish drying on the stovetop, not just with a towel — this one habit prevents most rust complaints we hear about.
• Do not stack a still-damp pan under or over another pan; let each one dry fully first.
• Wipe with a thin film of oil before storing, especially if the pan will sit unused for a few days.
• Store on an open, ventilated shelf rather than inside a closed, damp cabinet.
• If a pan has been idle for a while, give it a quick wipe and a once-over on the flame before your next use, just to be sure.

Keep a Trilonium TilCrust™ Beeswax Seasoning Tikki Handy

This is exactly the kind of season where our Trilonium TilCrust™ Beeswax Seasoning Tikki earns its place in your kitchen drawer. It is made to season and condition all your cast iron, carbon steel, and iron cookware — a quick rub on a clean, warm pan is enough for a touch-up, without needing a full re-seasoning session every time.

Rust is never a reason to worry about your Trilonium cookware's durability — the iron underneath is built to last a lifetime, and it is only the seasoning on top that ever needs a little renewal from time to time. A few monsoon habits, and your pan will see you through the season looking exactly as it should.

With warm regards,

Avinash Kalro