IS IT SAFE TO USE BLEACH ON NATURAL STONE?

Despite its well-known stain removal and disinfecting properties, many surfaces, including natural stone, typically avoid bleach due to its potential for damage and adverse effects.  Let’s discuss the effect of bleach on marble and other natural stones.

CHEMICAL REACTION

Natural stones are susceptible to substances with both low and high pH values. Bleach, which is composed of sodium hypochlorite, is a strong alkaline chemical with a particularly high pH level.  When natural stones are exposed to bleach, the chemical reaction removes the polish from the stone’s surface, leaving it rough.  The surface becomes dull and loses its gloss. 

DISCOLOURATION AND ETCHING

Bleach reacts with the minerals and compounds found in natural stone.  This reaction can cause the stone to change its colour, resulting in unsightly discolouration.  The degree of discolouration varies according to the type of stone and the length of time it has been exposed to bleach. In addition, bleach causes etching on the surface of the natural stone, which detracts from the smooth and polished look of the stone’s surface. 

DAMAGE TO SEALER

Another major concern while using bleach on natural stone is the damage caused to the sealant coating on the stone. The sealant application is designed to protect the stone from stains, water damage, and weathering.  However, bleach dissolves the sealant’s protective coating, exposing the natural stone to damage.    

WEAKENED STRUCTURE

As bleach penetrates the sealant’s protective barrier to reach beneath the surface of the natural stone, the resulting chemical interaction between the minerals in the stone causes the minerals to degrade.  Bleach, for example, can oxidize iron minerals, resulting in the production of more structurally unstable iron oxides through microfractures and voids inside the stone.  Furthermore, it makes the stone more susceptible to environmental deterioration, resulting in a weak interior structure. 

ALTERNATIVE CLEANING SOLUTIONS

Having established that bleach is not compatible with natural stone surfaces, we need to examine the safer alternatives.

·  Use pH neutral cleaners: These are non-acidic and non-alkaline and specifically formulated for the cleaning of natural stones.  They are exceptionally effective at removing dirt and light stains without damaging the stone.

·      Use gentle cleaning tools: To clean natural stones, use a soft microfiber cloth or sponge.  Abrasive and scouring pads that may scratch the stone should be avoided. 




Despite diligent management, natural stones can deteriorate over time.  For stubborn stains, it is better to seek professional assistance.  Natural stones are difficult, and each variety of stone has specific maintenance requirements.  Consult an experienced stone expert to provide a customized solution to all of your stone related issues. 

Visit us at  https://www.aplustouchstoneservices.com or write to us with your all your concerns at info@aplustouchstoneservices.com  

Location: Mumbai, Maharashtra, India

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