Before you try anything: always speak to a professional before cleaning, treating or applying any product to your stone. Every slab is different, and the wrong product can cause permanent damage. Contact us or a qualified stone restorer first.
Quick answer
Coffee stains in limestone are tannins that have soaked into the stone. Blot, wash with pH-neutral soap, then draw the stain out with a hydrogen peroxide poultice covered with plastic for 24 to 48 hours. Coffee is acidic too, so if a pale, dull ring remains once the brown has gone, that part is an etch and needs polishing, not more poulticing.
First, check what you are dealing with
- Brown or tan ring, surface still smooth: a stain. Follow the steps below.
- Pale, dull or slightly rough ring: an etch from the coffee's acidity. See fixing etching below.
- Both: remove the stain first, then deal with any dull mark.
What you need
- Paper towel
- pH-neutral dish liquid
- Hydrogen peroxide
- Flour, talc or diatomaceous earth
- Plastic wrap and tape
- Plastic scraper
- Gloves
Step by step
Blot, do not wipe
Soak up any liquid with paper towel straight away. Wiping spreads it across a bigger area.
Wash the area
Clean with warm water and a few drops of pH-neutral dish liquid, rinse and dry with a soft cloth so you can see what is left on the limestone.
Test first
Try the mixture on a hidden spot of your limestone (inside a cut-out or under an overhang) and check the finish after it dries.
Mix the poultice
Stir an absorbent powder (plain flour, talc, diatomaceous earth or whiting) into hydrogen peroxide (3% from a pharmacy for fresh stains, or 12% from a hairdressing or pool supplier for older ones) until it has the consistency of peanut butter.
Apply it
Spread it 5 to 6 mm thick over the coffee ring, extending about a centimetre past the edge.
Cover and wait
Cover with plastic wrap, tape the edges and poke a few small holes so it dries slowly. Leave it 24 to 48 hours until completely dry: the drying is what pulls the stain up into the powder.
Remove and rinse
Lift the dry poultice with a plastic scraper, rinse with clean water and dry the limestone. If the coffee ring is lighter but still there, repeat up to three times.
What not to use on limestone
- Vinegar, lemon juice or "natural" citrus cleaners: they etch limestone.
- Scourers, steel wool and abrasive creams on a polished surface.
- Mixing cleaning chemicals, especially bleach with anything else.
- Bleach: it rarely lifts tannin stains from stone and can damage the finish.
When to call a professional
Call a stone restorer if the stain survives three poultices, covers a large area, or has left a dull etch ring you cannot polish out. A restorer can re-hone limestone and repair chipped edges with colour-matched filler.
Understanding coffee stains on limestone
Limestone is one of the most absorbent benchtop stones. Oil and water can darken it within minutes, and stains tend to sit deeper than they do in marble.
Limestone is sedimentary calcium carbonate, softer and more reactive than most marbles, so acids etch it very quickly.
A restorer can re-hone limestone and repair chipped edges with colour-matched filler.
Good to know
Limestone often needs two or three poultice rounds for coffee because the stain sits deeper than in marble. Each round should leave it noticeably lighter.
Stop it happening again
Whether yours is French, Portuguese (Moleanos, Moca Creme) and Australian limestones, repairing it fixes today's mark; protecting it stops the next one. Our clear Stone Protection Film sits over the surface, so acids cannot etch it and liquids cannot soak in. Most limestone is honed, so the Matte/Satin film is the usual match: it keeps the natural, low-sheen look. It is installed across Sydney with a 10-year written warranty.
How we protect limestone · Stain removal guide · Coffee stains on every surface