My granddaughter and one of her friends did a science experiment adding food coloring to tap water & then to salt water. They used four cups (two with salt water & two with tap water). Into one tap water & one salt water, they added one color food coloring and then a different color in the other two. In both salt waters, the food coloring was still floating at the top. The food coloring changed the color of the tap water within 10 minutes. I am just having trouble figuring out the best way to chart the findings for the Science Board.