There is a kind of calligraphy in which capital letters are white. The background is black. What's this form called? Or what font it's called or ... how did it get like this?

Of course, I have also heard of calligraphy, which was created by the famous calligrapher Yan. Even Bai Mo was original and adjusted by himself.

So you should look up some information about him.

Bai Mo is a colorless, odorless and transparent liquid, just like mineral water.

Physical properties are different from those sold in the world and used in calligraphy and painting.

And the effect of fountain pen is similar to that of black ink.

Software, photoshop is very convenient, just "reverse".