The red and black of the building's diaphragm is not just a color difference
2. The color of the film paper on the surface.Generally speaking, brown film paper is better and more expensive.But the board core, that is, whether there is difference between the base plate and the black film version, that should see how specific manufacturer is defined.
No matter on the surface of the brown and black, or side paint the red color, there is no specific provision in the industry, has no unified rule, all by the manufacturers own definition, and definition of each manufacturer also is not the same.
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