bitter(Noun) A liquid or powder, made from bitter herbs, used in mixed drinks or as a tonic. bitter(Noun) A type of beer heavily flavored with hops. bitter(Noun) A turn of a cable about the bitts. bitter(Adjective) Having an acrid taste (usually from a basic substance) The coffee was bitter.
The word chalk comes from the Latin word âcalxâ. We get chalk from limestone. Most of the chalk you find today was made almost 60 to 100 million years ago. It is chemically made of calcium carbonate.
Dust fling up in the air will do harm to respiratory system, because of the conventional making method of chalk. The main ingredients are calcium carbonate or lime. now a new kind chalk, named Biaxi, absolutely finishes the dust, and is welcomed by teachers and students in China.