The Truth About Marble/Granite Surface Plates: Beyond Color Perception

https://www.Granite-components.com，E-mail：Granitecomponents@163.com                  

Many buyers often assume that all Marble/Granite surface plates are black, but this is not entirely true. The raw material for Marble/Granite surface plates is usually gray. During the manual grinding process, the mica content in the stone may decompose, forming natural black streaks or shiny black areas. This is a natural phenomenon, not an artificial coating, and the black color will not fade.

Natural Colors of Marble/Granite Surface Plates

Marble/Granite surface plates can be black or gray, depending on the raw materials and processing methods. While most plates on the market are black, some are naturally gray. To meet customer preferences, many manufacturers artificially dye the surface black. However, under normal usage, this has no impact on the plate’s measurement accuracy or functionality.

Standard Material: Jinan Black Granite

According to national standards, the most recognized material for precision Marble/Granite surface plates is Jinan Black Granite (Jinan Qing). Its natural dark color, fine grain, high density, and excellent stability make it the benchmark for inspection platforms. These plates offer:

• High measurement accuracy

• Excellent hardness and wear resistance

• Reliable long-term performance

Due to their superior quality, Jinan Black Granite plates are often slightly more expensive, but they are widely used in high-end applications and for export. They can also pass third-party quality inspections, ensuring compliance with international standards.

In today’s market, Marble/Granite surface plate manufacturers generally fall into two categories:

• High-End Manufacturers

◦ Use premium granite materials (such as Jinan Qing)

◦ Follow strict production standards

◦ Ensure high precision, stable density, and long service life

◦ Products are suitable for professional users and export markets

• Low-End Manufacturers

◦ Use cheaper, low-density materials that wear out quickly

◦ Apply artificial black dye to imitate premium granite

◦ The dyed surface may fade when wiped with alcohol or acetone

◦ Products are mainly sold to price-sensitive small workshops, where cost is prioritized over quality

Conclusion

Not all Marble/Granite surface plates are naturally black. While Jinan Black Granite is recognized as the best material for high-precision inspection platforms, offering reliability and durability, there are also lower-cost products on the market that may use artificial coloring to mimic its appearance.

For buyers, the key is not to judge quality by color alone, but to consider material density, accuracy standards, hardness, and certification. Choosing certified Jinan Black Granite surface plates ensures long-term performance and accuracy in precision measurement applications.