PT403 black is a solvent-based, impregnating, colour-enhancing, stain-proof and wet-look non-filming treatment. It is used to enhance the colour and tone of absorbent surfaces, adding a matt finish without creating a surface film. PT403 black is recommended for treating natural stone, agglomerates, cotto and terracotta, and all materials with a medium-low, medium and medium-high level of absorption.