We will simulate this by using invisible ink. However, the objects in the room are still there even though we cannot see them. When we close our eyes or are in a very dark room with no light at all, we are no longer able to see. As the light hits our eyes, retinal “switches on” our vision. To begin this explanation, we will talk about the source of this switch, a molecule called retinal which is in all of our eyes. In our eyes, the switch is much smaller than a light switch, however, there is a reaction in our eyes that works as a switch to turn “on” and “off” our vision. The word switch probably makes you think of a light switch.

Investigatory Project (2019-2020) XII STANDARD Invisible Ink: Modelling A Molecular Switch Page |5 THEORY Our vision is often described as a molecular switch. Then to write and visualize words using invisible ink. Investigatory Project (2019-2020) XII STANDARD Invisible Ink: Modelling A Molecular Switch Page |3 INDEX  AIM  THEORY  MATERIALS REQUIRED  ACTIVITY  TIPS  PROCEDURE  BIBLIOGRAPHY Investigatory Project (2019-2020) XII STANDARD Invisible Ink: Modelling A Molecular Switch Page |4 AIM To make invisible ink.

Above all I thank Almighty who is always there to help me. I also thank my Principal _for her immense cooperation. I am also thankful to my parents, my classmates, whole staff of the school for their timely help.

I also express my gratitude to_, Chemistry teacher, without his valuable guidance it would have been impossible to complete my project work. SIGNATURE(PRINCIPAL) SIGNATURE (SUBJECT TEACHER) SIGNATURE (EXAMINER) Investigatory Project (2019-2020) XII STANDARD Invisible Ink: Modelling A Molecular Switch Page |2 ACKNOWLEDGEMENT With immense pleasure, I extent my heartful thanks to those who help me to go a long way in the completion of this investigatory project. The references taken in this project have been declared at the end of this report. This project is absolutely genuine and does not contain of any plagiarized materials. Invisible Ink: Modelling A Molecular Switch Page |1 CERTIFICATE This is to certify that _, student of Class XII of _ has completed the Investigatory Project on topic “INVISIBLE INK: MODELLING A MOLECULAR SWITCH” Under the guidance of _(Subject teacher).

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