Every color day, I make a bottle of colored water. Of course, on the secondary color days I miraculously "can't find" the orange, green and purple "rainbow drops", so we brainstorm how we will make it. Eventually, the children come up with mixing the colors and we create "magic" in the bottles using the primary colored water. The really neat thing is that when you hold the bottles one in front of the other (ex. red in front of yellow), you can actually see it making orange before you actually mix the colors together!
We make mosaic rainbows on black paper. I just cut strips of each rainbow color and then cut squares and rectangles (to also reinforce our basic shape unit we do at the beginning of the year). I copy a rainbow onto black paper that has Rs where the the red shapes go, Os where the orange shapes go, etc. This is so fun and makes a great display when they are all done.
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