How do you clean Giallo Siena marble?
With a soft cloth or a non-abrasive mop and a cleaner made for marble, neutral in pH.
Answer
Will acid damage Giallo Siena marble?
Keeping the surface
Yes, and permanently. Giallo Siena marble is 95 to 98 per cent calcite, and calcite dissolves in acid. Lemon, vinegar, wine and acidic cleaners etch the polish off, and an etch is a dull lighter mark that has to be re-polished rather than cleaned off.
The figures
| Property | Value | Source |
|---|---|---|
| Calcite content | 95–98 per cent | published petrographic note |
| Published water absorption | 0.04–0.3% | EN 13755, published ranges |
| Effect of acid | Etching — the polish is chemically removed | published material note |
Why this stone behaves this way
Calcite is calcium carbonate. Acid turns it into a soluble salt that the surface loses, so the polished film is gone rather than stained. An etch is therefore a surface loss, not a discolouration, and no amount of cleaning shifts it.
What these figures are, and what they are not The figures here are published ranges for the material. The published sources do not agree on a single number, and the wider range is the honest one to design against.
Where these figures come from
- S1 granitalsiena.com — Giallo Siena marble technical sheet (EN standard test values; Politecnico di Torino marble laboratory)
- S8 lxcc.com — Giallo Siena product page (composition, acid sensitivity, sealing cycle, installation)
Where to go next
On the same subject
More questions about Giallo Siena marble
Does Giallo Siena marble scratch easily?
Stone does not scratch easily, but it does mark, and on a polished Giallo Siena marble surface a mark cannot be polished out without taking the whole polish with it.
This answer sits on the Keeping the surface page, with the rest of the questions about it.
Care and maintenanceAsk for a price
A thickness, a format, a finish, a quantity and a destination will get you a quotation for Giallo Siena marble.
Will acid damage Giallo Siena marble?