If anyone knows from high- altitude baking, it is expert Susan G. Purdy, author of the seminal baking book "Pie in the Sky"an indispensable resource for anyone who bakes cakes, breads and pastries at altitudes over 3,000 feet (in other words, anyone baking in Colorado).
![](https://webarchive.library.unt.edu/web/20090922021418im_/http://extras.mnginteractive.com/live/media/site36/2008/0531/20080531_095504_singlepixel.gif)