The tiles heat up but protect the paper from burning.) White tiles (For using on the hotplate.Paintbrushes (and/or straws, cotton buds, spills).Sucrose (table sugar) solution (1 tsp in 10 cm 3 water).Soapy water (or 0.1 M sodium carbonate).Baking soda (sodium bicarbonate) (or 1 M sodium hydrogen carbonate).Heat-activated invisible inks Equipment:Īny of the following for your invisible inks: How you reveal the message depends on the ink you used. It would be good to use different types of ink as advised by your teacher. Pass the message to another group who will write an answer to the question and pass it back to you to develop. Use one of the methods below to write a question on a piece of white paper. Like all good science-artists, you decide to investigate further… You wonder if there is a way of writing with an ink that is only visible under certain conditions. You have been tasked by King Agis of Sparta to develop a way of delivering secret messages to his armies, which would be unreadable if they fell into the enemies’ hands. It is 410BCE and the Ionian (or Decelean) war, between Athens and Sparta has been raging for four years. Using my scientific knowledge to explain how changing the conditions the inks are under affects their visibility.
Changing the conditions of the invisible inks to see if messages become visible.Writing messages with a variety of substances which can be used as invisible inks.RSC Yusuf Hamied Inspirational Science Programme.Introductory maths for higher education.The physics of restoration and conservation.Package content is not flexible and cannot be modified.
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