Autumn is the time of year were the leaves change color and fall. How the leaves change color is the chemicals inside the leaf they are chlorophyll and pigments. Chlorophyll is the chemical that makes the leaf green it also makes sugar for food. Pigments make the leaves red, yellow, orange and purple, but pigments don’t just change the color they also give all the sugar it has made to the tree so it can survive the coming winter until spring then the cycle starts all over again.