How To Use Colored Filters To Send Secret Messages

Science project

How to use Colored Filters to Send Surreptitious Messages

Have you ever wondered why objects have different colors? Have you lot too e'er wondered what it would be similar to work equally a cloak-and-dagger agent and transport surreptitious letters to people? Bear this experiment to observe out.

Detect what colored filters practise to lite.

Reddish filter (Red cellophane wrap works)
Shoebox lid
Markers or crayons
White newspaper (several sheets)
Tape
Scissors

Cut out a pigsty in your shoebox lid and tape the red filter over it then that the filter covers the entire pigsty. Make sure your hole is large enough to permit yous see a sail of paper through it.
Accept a sail of white paper and draw on it using several colors. It might be interesting to draw a band of colors where each private color appears in the aforementioned sequence it would appear in the rainbow.
Look at the paper through your shoebox filter. What happens to each color?
Next to each color, make a note describing what information technology looked similar nether the cerise filter.
On a new canvass of paper, write your clandestine message. It could be directions to treasure, a secret you want to share with someone special, or annihilation yous like. You volition want to use a color y'all know you tin run into through the filter.
Have the colors that disappeared when you used your filter and scribble all over your message. Don't fill it in solid, but try to make it equally difficult for an observer to see your message as possible.
Expect at your message using your filter. Can you read information technology?

When you look at your paper through your filter, some of the colors will disappear. The colors that disappear would be located next to each other if you lot were to attempt to find those colors in the rainbow. If yous used blue, green to write your message, you should have seen the bulletin as blackness or brown when you observed it through your filter. If you weren't able to meet your message, you may not have written it using the correct colour, or perchance you scribbled over your message with colors that appear black when viewed through your filter.

Color is a special property of light that we can discover because our eyes have pigments in them that absorb color. These pigments tell your encephalon that they detect those colors. All the colors you can see are due to our encephalon detecting different combinations of red, blue, and greenish light, and when you run into the color white, you're seeing all iii of these colors blended together.

When light is emitted from something, like a telly or a figurer screen, we notice dissimilar combinations of colors added together: all iii colors added together gives you white, and combinations of two colors brand new colors like yellow, cyan, and magenta. Those colors are called additive secondary colors and merely appear when ii additive chief colors (crimson, blue, or light-green) are added together. Combining different levels of the iii primary colors can produce any visible color. That's how figurer and tv set screens create images.

Some other kind of light is reflected lite, or light that bounces off of something. Colors from reflected lite are called subtractive colors because the color you come across is the result of certain colors getting subtracted through absorption. Objects absorb or reflect certain colors of low-cal depending on their physical chemistry. White paper reflects all colors well—that'southward why information technology's white! Ink from markers or crayon wax reflects only one color or a limited combination of colors. The subtractive primary colors are magenta, cyan, and yellow. The subtractive secondary colors are cerise, blue and green.

Cerise marker ink absorbs blue and green light, but allows red to reverberate off of your paper and get picked up by your optics. Like ink, your ruby-red filter also absorbs blueish and green low-cal. When you look at your paper through your crimson filter, the paper looks red because the filter simply lets cherry-red through. When y'all marked with your blue or green colors, nonetheless, the ink absorbs the color red. No red low-cal is captivated by the filter, so you can see those colors through the filter relatively unchanged.

The reason that wet marker tips announced dark is because ink on its own doesn't reflect lite very well—it absorbs. If you've e'er tried to utilize a marker on a dark fabric, you've seen this in action. Markers are bully for use on overhead projectors, though, since they will transmit the light of their color. Unlike markers, wax from crayons or colored pencils reflects light of its color and absorbs everything else—this is why you can easily tell what color a colored pencil is by looking at its tip.

Effort exploring the world while looking through your filter—yous might observe some dandy things! The sky is a smashing place to start.

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