Why Is the Blackboard Green

Generally, a blackboard is one of the pre-requisite features of any academic class. You can write and display text and drawings on it with the help of chalk or marker. Typically classroom boards are made up of sheets of some black or dark grey material. Recent years, however, have witnessed an immediate shift from black to green colored boards.

Blackboard or Chalkboard:

Different terms and names used to designate blackboards, create a great deal of ambiguity, should be clarified in the first place. Whether Blackboard or Chalkboard, both are the same titles to refer to the same object — classroom board used for teaching. Difference is just that of usage in different places, such as for example, Chalkboard is more extensively used in the United States and Blackboard in other parts of the world. The usage of blackboard dates back to period around 1935.

Blackboard Why Is the Blackboard Green

Composition of a typical classroom board:

During previous decade the boards in question were furnished from slate, grey or black. This may be a reference from where it took the traditional title of ‘Blackboard’. In many countries there is a custom of covering boards with green color. Some recent varieties include those made of porcelain, a very durable material as far as wear and tear is concerned. Porcelain boards, famously termed as Whiteboard, often come in white finish. Some of them are available in green or black as well.

There are certain varieties prepared from coiled plastic sheet. The sheet is drawn with built-in rollers; this kind of sheet which is scrollable / adjustable as per requirement and frees you from erasing it every now and then.

Modern studies have elicited that green color is comparatively more soothing for the eyes and helps prevent fatigue. The studies further explored that human eye is very much receptive to the green color and hence the use of green boards was beneficial.

Why green color is soothing for eyes:

Bright colors, such as, orange or yellow can prove strenuous if looked at for a prolonged time. Today, however, they are available in the market in different colors. After green, black and white are most popular colors classroom teaching boards are sold in.

There are two kinds of photoreceptor cells present in retina of the eye, namely, cones and rods. An eye has approximately 120 million rods, responsible for ‘scotopic’ vision. Rods help the eye to realize light or darkness.

Cones are the cells that detect and distinguish different colors. About 6 to 7 million cone cells, present in retina, are divided into three distinctive types, viz. red, green and blue cones. The cones are, however, relatively less sensitive to light, but they exhibit highly sensitiveness behaviour for a range of high resolution vision.

The above arrangement of cones and rods reflects that on an average scale green colored boards are more convenient for students. Whether ‘Black’ or ‘White’, it is just a matter of reference to designate the same object meant for teaching. Now which to prefer, is again a matter of feasibility: for higher classes, definitely the teacher has to write a lot of contents across the board, so white with smooth sheet will be the best option.

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