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Secret Message Poster

Cool Science, Quick Crafts

overview

we love this *spy* inspired poster for its clever use of color to reveal a secret code!

30 minutes

maker checklist

  • poster board
  • markers
  • scratch paper
  • red acetate gel (or DIY!)
  • magnifying template
  • scissors + glue

instructions

make your spy-glass

1

sketch a simple spy glass on heavy paper and cut it out. cut out the inside too!

2

cut a circle of red acetate to fit the opening for the “glass” in your spy glass!

or try this!

use clear acetate or plastic film (like the clear panel from a pasta box!) and color it evenly with a red sharpie. voila! once you’ve created your red filter, cut it to shape.

make your poster!

1

test your markers to see which colors are visible with your acetate and which ones are not. just make some marks on a piece of white paper, and lay the acetate on top of it.

tip!

the red acetate cancels out the warm colors, leaving cool colors visible.

2

write your message with the marker color that stays visible. leave lots of spaces between your letters.

3

fill the spaces with random letters in the colors that disappear.

3

hang the spy-glass from your poster by a string, so friends can discover your secret message!