Can anyone explain how to identify the type of common solar panels (monocrystalline, polycrystalline

The appearance is easy to distinguish:

Monocrystalline silicon is a blue wafer with a very sharp and uniform surface;

Polycrystalline silicon is also blue, with many irregularities on the surface. Surface. Texture;

The color of amorphous silicon is dark brown, just like the color of photographic film, and you can't see the feel of the crystal.