The color of brown aluminum oxide is sometimes considered a mystery by many. For various reasons, it inexplicably changes color. Although it's always brown, it can vary from light brown to tan, or even to a reddish-brown.
Many people also understand that the color of brown fused alumina can reflect its quality, so they doubt its quality based on its color. This is, of course, a mistake.
The color of brown aluminum oxide is affected by many factors:
1. There are two reasons why some brown fused alumina is brown-red: one is that it contains some impurities after calcination, which causes its color to turn red, but its quality is not a problem. The other is that unscrupulous merchants mix garnet sand with brown aluminum oxide, which causes the color of corundum to turn red. In this case, the quality of the brown fused alumina is not only problematic but also very problematic.
2. Some brown aluminum oxide is light brown, mainly because its particles are too small. Brown fused alumina itself is brown and has a certain light transmittance. When the particles become smaller, its color will become lighter accordingly.
In short, we must have a correct understanding of the color of brown fused alumina. Some people think that the redder the color of brown aluminum oxide is, the higher the quality is. But is this really the case? The result is obvious.
