If you want to create your own chemistry-based Saint Patrick’s Day magic but you don’t have a river to dye, you can make a mini density rainbow using food coloring, sugar, and water.

The bright green color will only persist ... According to the story, the dye used to detect leaks in the sewer system along the Chicago River turned the water green, and the idea was born to ...

While the water ... sprays dye out of plumping pipes and spout pumps. But the mysterious mixture doesn't come out green - it's actually orange. However, once the dye sets in, the color changes ...