Simple Kids Crafts is a video blog dedicated to reviving the old art of handicrafts for people of all ages. How do oil spills affect aquatic plants? A Miniature Solar Panel Fire Water Balloon Make Clouds in a Bottle Secret Messages Make a Rocket Make a Hovercraft Make an Anemometer Make a Sundial Make a Radio Make an Electroscope Make a Stethoscope Make a Telescope Make a Periscope Make a Camera Bending a stream of water with a comb Lighting a bulb without electricity Simple Motor Cotton Ball Rocks? Salt-Absorbing Art and Science Color Changing Glue Art Baking Soda Clay Oil Sun Catcher Grow a Pineapple Plant! Bead Bowls Wow, what an Air-Gun Funny Diver ! Water boils without fire Ice with Boiling Water Water that boils instantly Water boils in a Paper Pot Soap-driven Boat Pulse Moves Pin Pretty Garden—without Plants Picture made by Fire Magic Pictures Dancing Doll Smoke Goes Down The Dancing Coupl The Umbrella Dance Magic Butterfly Colorful ...
We all are familiar with ink. It is the fluid inside a pen that allows us to communicate with others through written text. But, most often the communication is not exclusive, that is, anybody who can see the writing on the paper can in principle read the message written on it. Situations are possible when we would not like it to be so, that is when we want to communicate a secret written message. Is it possible? Definitely, science can make it possible. One can make an ink which instead of a dye solution (a coloured solution) has a colourless solution which can be made visible by some method. That is precisely the principle of invisible inks. An invisible ink is a solution which can be used to write with. The written message is either invisible on application or disappears quickly. It can be made visible by some means. The use of invisible ink is a form of steganography, and has been used by spies. The simplest invisible inks are organic compounds -- vinegar, lemon ...