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Do you have a hard time matching paint swatches with your furniture? When you consider human perception, color is context dependent.

This science activity demonstrates the dominant eye phenomena. What does your brain do when it sees two images that conflict?

Learners analyze mixtures of dyes using filter paper chromatography. They place spots of the different dyes at the bottom of a piece of filter paper, and hang the paper to touch the surface of water.

In this activity, learners use chemistry to produce weathered "antiqued" paper with burned edges. Learners first soak white paper in coffee and then apply a charring solution of ammonium chloride.

Learners observe different paper samples under ordinary room light and under a black light to learn some of the chemical differences between different types of paper.