After a discussion about how foil is used and the material from which it is made, PreK scientists listed physical properties of foil. They said it was silver, shiny, and smooth. It can be torn and folded, and they observed that it reflected light.
Then we discussed the colors you might see on a snowy day. We noticed that white and blue were the primary colors in several photographs.
Finally, I demonstrated that you can make a color lighter by adding white. That new color is called a tint.
We put all these concepts together when we moved to the lab tables. My youngest scientists combined white and blue paint, as they painted on aluminum foil with a swab. The swab glided over the foil which was also an introduction to friction. When each student finished, we pressed a black piece of paper on top of the foil and made a print.