Autumn Colors - How Leaves Change Color

The "Indian summer" days of autumn, when the days are clear and sunny and the nights cool and crisp, provide an almost irresistible lure to those who enjoy the outdoors. This type of weather is also the most favorable for a spectacular show of autumn colors, making this season of the year still more delightful.

The link address is: http://www.na.fs.fed.us/spfo/pubs/misc/autumn/autumn_colors.htm