In class we did this cool lab were we took a white piece of white paper and made a dot with a highlighter. Then we put the tip of the paper on a cup with water. We observed that the highlight color was going up the paper while forming different shapes. Each color forms different shapes. We also learned that FBI and the police uses this method of what the reaction will be to see if the pen (for example that a note was written) is the same as the suspect's and if the reaction is the same it means the pen (for example is the same)
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