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Granite, as a common building material, is widely used in fields such as home decorations and furnishings, building construction, and roads due to its hardness, durability, diverse colors, and excellent texture. With the development of technology, many businesses often use dyeing techniques to make the color of granite more vibrant or meet specific needs. The dyed granite has a more uniform and bright color, but its quality and durability are different from natural granite.

1. Uniformity of color of granite

The color of natural granite usually has a certain degree of non-uniformity, which is due to the influence of geological environment during its formation process. The mineral composition and structural distribution are not completely consistent, resulting in natural differences in surface color and texture. The color changes of natural granite are usually manifested as spots, veins, or subtle transitions, giving a natural and layered visual effect.

Granite that has undergone dyeing treatment usually presents a more uniform color. This color is usually artificially controlled, and the color distribution will be more consistent and saturated. For example, the surface of dyed granite may exhibit overly consistent color regions without the natural variations unique to natural hues. If it is observed that the entire surface color is very uniform and lacks color difference changes, it is likely that it has been dyed.

2. Observe textures and patterns of granite

The texture and pattern of natural granite have unique natural properties, and they are usually irregular, exhibiting obvious naturally formed cracks, mineral veins, spots, and other characteristics. The texture of dyed granite often appears relatively simple or repetitive, and dyeing may mask some details on the surface of natural granite, especially in terms of texture changes. Dyeing treatment usually involves the infiltration of dyes into the surface of stone, causing a change in the color of the stone, and this dye does not alter the internal structure of granite. Therefore, observing the changes in texture and corresponding details often reveals traces of dyeing treatment.

For example, if you see the same veins or spots appearing regularly on the surface of the stone, it may be the result of artificial dyeing. The texture of natural granite is unique and does not exhibit large areas of repetitive patterns.

3. Observe the depth and distribution of colors of granite

Stained granite usually presents bright and saturated colors due to the influence of the surface staining layer. For granite with dark tones, the color of the dyed stone will appear darker and even glossy. The color of natural granite is relatively more natural, with less intense and softer hues. Especially in some dark colored granite, the surface of natural granite may have uneven color and slight fading.

In addition, the color distribution of dyed granite is usually more regular, while the color of natural granite is often more natural, with more randomness in color and pattern distribution. If the color of granite appears too bright or full, and lacks natural variations, it can be suspected that it may have been dyed.

4. Touch surface of granite

Touching the surface of granite can help us perceive its texture. The surface of natural granite is usually rough and has a natural texture. The surface of dyed granite may undergo smooth polishing treatment, resulting in a finer and smoother texture, and sometimes the surface coating is thicker, especially in cases with strong luster. This is because after dyeing treatment, merchants often use brighteners or polishing agents to enhance the surface effect and make it more aesthetically pleasing. Therefore, if the surface of the stone is very smooth and lacks natural texture and touch, it may have been dyed.

5. Edge observation method

In addition to observing the surface, the edge of granite can also provide some useful clues. The color and texture of natural granite usually extend to the edges of the stone, while dyed granite may only have dyeing treatment on the surface. By observing the cross-section or cutting surface of the stone, the internal color of the stone can be viewed. If there is a significant difference between the internal color and surface color of the stone, or if there are traces of dye layers on the surface, it is likely that this granite has undergone dye treatment.

6. UV lamp detection

Using ultraviolet lamps to irradiate the surface of granite can sometimes determine whether it has undergone dyeing treatment. Natural granite usually does not show any significant reaction under ultraviolet light, while dyed granite may emit light or undergo some kind of reaction under ultraviolet light due to different dye compositions. For example, certain dyes may exhibit fluorescent effects under ultraviolet light or show different color changes.

7. Texture and hardness of granite

Natural granite has high hardness and a relatively hard texture, which is not easily affected by friction or carving. However, for granite treated with dyeing, if the dyeing agent does not penetrate deeply into the interior of the stone or the surface treatment of the stone is improper, it may result in a more fragile surface or insufficient adhesion of the dye layer, thereby affecting its durability and hardness. By conducting a simple hardness test, such as scraping the surface of granite with a hard object, one can determine its hardness and infer whether it is natural granite.

Distinguishing the natural color and dyeing treatment of granite requires multiple observations and comparisons. Understanding the natural color characteristics of granite, combined with comprehensive judgment of color, veins, surface texture, and cutting surface, can help us distinguish whether it has undergone dyeing treatment. When choosing granite, consumers should choose natural stone that is both beautiful and durable according to their own needs, to avoid affecting its service life and appearance due to dyeing treatment.