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Technology manufacturing chalk lime has improved dramatically in recent decades and is very common to use the reduced powdered chalk. Which it is of much better quality and produces 90% less dust chalk lime 70s As the dust is heavier and does not float in the air. It does not affect the health of teachers and students. Also pupils viewing is much better. Since it has shine.
Common chalk markers uses was made with a mixture of gypsum and lime. They have already been several decades since the initial use. It was made of traditional wood. It had to apply several coats of sealer and also several layers of paint to easily erasable. It was almost always rectangular in shape and could be found in almost all countries, both black and dark green. It was there that turned the whole environment of the class. The student could read on the surface of markers, could take note after what the teacher wrote or had to go to give the lesson or an exercise. They were used in public or private schools. It was a great tool and maintenance work was very economical, for the very low cost of chalks. The slates were repainted at the beginning of the school year.
One of the main problems that were caused by this board was the dust that was ejected when cleaning the draft. This depended on the quality of chalk markers uses was used. A number of people causing respiratory problems, especially those who were allergic to dust. This was one of the points for the slate blackboard chalk liquid or better known as acrylic board, gain more popularity over time. This does not generate dust and it is much easier to clean, due to the material used in its surface is very smooth and easy to clean.
Now it is very common to use the blackboard to announce menus in restaurants, bars and shops. Since it has a better view of reading and can promote any product in an excellent manner. Besides technology it has also created fluorescent markers for blackboard chalk markers uses. With which you can better show what you want to communicate to the customer.
