Q: What is black cardboard? And black cardboard is used for mounting, right?

The above introduction is too general,

Black cardboard can't be simply described as hard (thickness is too simple). The unit of cardboard is gram (not weight, but thickness). Our ordinary sketch paper is better than 200G g, so when you go to the painting shop, you should be optimistic about the hardness of the cardboard you want to buy. Above 800G is best. The price also increases with the hardness and thickness (grams) of cardboard.

The way to save money is: I suggest you don't go to the painting shop. Wedding Frame Building (Beijing Wukesong Photography Equipment City) will be cheaper.

When it comes to framed and unpretentious paintings, just paste the works directly. But for exquisite paintings, two pieces of cardboard with the same size should be used, one for the base and the other for the frame (dig a hole in the middle to expose the work). If you pay more attention, add wooden frames and glass frames (you need to find a special installation place)

As for the works inside, as long as they are paper. Mainly depends on the size. The bigger the size, the bigger the cardboard you buy. It is best not to exceed the whole opening. (Because the paper jam is not more than full)

I wish you a successful game:)