Graphenes are the large polycyclic aromatic hydrocarbons.They have got this name by their similarity to graphite.Even though they have been synthesized in the laboratory,recently, their applications are numerous.
However,they are used as a materials for special-purposes in electronics,the most.The great contribution for solving problems related to the synthesis of these large polyicyclic aromatic hydrocarbons has the German chemist Klaus Müllen.

The sunlight which illuminates the Earth is actually white. White light is nothing else but the combination of all colours (the entire spectrum of wavelenghts). When the object is exposed to white light, it absorbs almost all colours, but it still deflects some of them. That deflected part of the spectrum is the colour we see. This can only apply to objects that are intransparent, that don`t pass the light.