black surface - it is covered with a material that reflects exactly 3% of light, in combination with a gray and white card it is used to assess the contrast of the photographed scene,
white plane - reflects 90% of the incident light, is a great tool to set white balance and obtain the correct color reproduction in the photo,
gray plane - reflects 18% of the incident light (so-called medium gray, located almost exactly in the middle between black and white), thanks to the gray card you can accurately determine the exposure in difficult lighting conditions or when taking photos of objects with a reflecting surface,
silver surface - strongly reflects light when you need to draw contrast from the exhibition.