Nikola Teslaâs invention of the laser may be one of the best examples of the good and evil bound up together within the mind of man. Lasers have transformed surgical applications in an undeniably beneficial way, and they have given rise to much of our current digital media.
by Demand Media. Special fountain tints or dyes are used to turn water blue. While the color blue is often used to to depict or represent water, in reality, blue is only a reflection of the atmosphere around it -- the sky above, when dealing with natural bodies of water, or a swimming pool's walls, which are often painted a shade of blue or aqua.
Shine a black light at the water. Just like with the tonic water method above, a dark room and a black light will make the highlighter ink in the water glow brightly. You can also tape a flashlight to the bottom of the container to make a colored light (however, the neon effect you'd get with a black light is lost.)