What is the logo on the back of Guangdong Qingyun ceramic tile?

The bottom mark under the tile is a trademark. Most tiles are printed with their own trademarks on the back, and these trademarks will be suppressed when the tiles become embryos. There are different types of bricks, which are fired once or more. In short, trademarks and bricks are integrated, not post-printed, which is easy to distinguish.