"Yellow spots" refer to some yellow or brown marks and spots on the surface of stone, which may appear on marble and granite.

 

Some of these "yellow spots" formed on stone come from the inside of the stone, and some come from pollution outside the stone. The "yellow spots" formed on marble itself are mainly caused by some changes and internal components of marble after being damp. The reason why granite itself forms "yellow spots" is the change and phenomenon of iron elements in granite itself in a humid environment.

 

Yellow spots are formed by external pollution of stone, mainly some color-changing substances remain on the surface of stone, such as rust pollution, dye pollution, etc.

 

In addition, when installing stone, using resin adhesives, "oil seepage" will also cause "yellow spots" to take root on some stones.

 

When analyzing the types and causes of "yellow spots" on the surface of stone, pay attention to these phenomena.

 

First, the "yellow spots" on marble itself are mostly not "rust".

 

Second, it is necessary to figure out whether the "rust" on granite is "rust" caused by external pollution or "rust" itself.

 

The third is to observe the humidity of the stone, because the external cause of the "yellow spots" of the stone itself is still water.

 

Strictly distinguish the differences between marble yellow spots and granite yellow spots in terms of formation mechanism and removal methods.