These three situations appear separately, and appear together, all due to improper processing in the process of production or packaging, and the mixing of solidified glass glue blocks or sundry objects. Soft particles, hard block is due to the surface dry fast part of the surface crust and mixed with glue caused; It may also be caused by scraping glue on the bottom and face of the bucket when it is divided into different containers. Black spots are caused by unclean raw materials.