Why Does White Marble Turn Yellow? A Complete Guide✨

White marble symbolizes purity and elegance, but over time, many people notice it turning yellow. What causes this phenomenon? Below is a detailed analysis to help you better care for your marble surfaces.

🏛️ 1. Internal Factors

1. Mineral Composition

   • White marble primarily consists of calcium carbonate or dolomite, which may contain trace elements like iron and manganese. These elements can oxidize upon exposure to air or water, forming yellow rust stains. For example, iron in the form of pyrite may oxidize into compounds that leave marks on the marble's surface.
   • Additionally, some types of marble contain organic matter that may decompose or oxidize over time, leading to discoloration.

2. Marble Structure

   • The porosity of marble significantly affects its resistance to stains. Highly porous stones, such as Carrara marble, are more prone to absorbing dust or pollutants, which can react internally and cause yellowing.
   • Microcracks, often created during transportation or installation, allow external substances to penetrate, increasing the risk of discoloration.

🌿 2. External Factors

1. Pollutant Penetration

   • Liquid Pollution: Colored liquids such as tea, coffee, or iron-rich water can seep into marble, leaving yellow stains. Improper cleaning agents, especially acidic ones, can corrode the surface, exposing impurities and exacerbating discoloration.
   • Adhesives Used During Installation: Adhesives such as marble glue or AB glue can penetrate the marble and, over time, react with air or the stone's components, leading to oxidation and yellowing.
   • Gaseous Pollution: Airborne substances like sulfur dioxide or nitrogen oxides react with marble to form salt deposits, causing discoloration. Additionally, cigarette smoke contains nicotine and tar, which can settle on the surface and cause yellowing over time.

2. Light and Temperature Changes

   • Prolonged exposure to UV rays can accelerate the oxidation of organic materials within the marble, causing yellowing.
   • Fluctuating temperatures can cause thermal expansion and contraction, creating microcracks that allow pollutants to penetrate.

🌟 Summary & Recommendations

The yellowing of white marble can result from both natural internal properties and external environmental factors. To prevent this, consider the following:

• Regular Cleaning: Use gentle marble cleaning agents and avoid acidic products. 🧼
• Prevent Excess Moisture: Keep the marble surface dry and reduce exposure to iron-rich water or other colored liquids. 💧
• Minimize UV Exposure: Use protective films or coatings to shield the marble from sunlight. ☀️
• Use Professional Protective Products: During installation, apply Hanshi 130 Anti-Efflorescence Additive to block alkaline substances from adhesives or cement, and Hanshi 919 Sealant Primer to provide excellent protection for the base and all four sides of the marble. 🔒

Though delicate, white marble can maintain its timeless beauty with proper care. Save this guide to avoid common pitfalls! 📌