Chalkboard

         A chalkboard or commonly known as blackboard is perhaps the most common and oldest instructional material used in the classroom. Ask someone what a classroom looks like and the chalkboard is definitely on the picture. It is an instructional writing surface on which text, notes and or illustration are written or drawn. Chalkboards were made of smooth, thin sheets of black or dark grey slate stone or wood painted with slating or chalkboard paint. Most chalkboard are painted green because the color is said to be cooler and easier to the eyes. Modern chalkboards also include portable types which can be moved and can serve as dividers, covers and extra writing space. Chalkboards come with chalk and an eraser.

      Chalkboards are good to use since these are easily available, inexpensive and easy to install. Notes and discussion can be written as well as can be erased and revised. It can be utilized and prepared beforehand and even in on-the-spot or spontaneous discussion.
        On the other hand, the downside of using chalkboard is the fact that the writings are just temporary. After a day's lesson, the notes written will be erased and cannot  be saved for future use. Health is also a major concern for some since chalkdust may trigger allergy or pulmonary problems.
      Nevertheless, chalkboard has been in teaching usage for a long time. It is a convenient instructional tool for any student with varying ages. Even famous people have used this instructional tool and perhaps discovered the things we've never known before. Right Einstein?