Agree with all of the above with the exception of sealing with Linseed Oil, that's very old fashioned, there are modern colour enhancing breathable sealers available now that will protect the tile from dirt and staining whilst lifting the Red and Black colours. For expert advice and examples of previous Quarry tile restorations visit: Quarry Tiles – Cleaning and Sealing - Quarry Tiled Floors Cleaning and Sealing - https://quarry.tilecleaning.co.uk/
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