Here I am next to a few huge Mahogany logs at a mill in Southern Mexico on the Belize border around 1986. These logs were trucked over from Guatemala through Belize. Not many are left.
They are milled into lumber and put into a drying rack standing up.
This allows the wood to dry naturally and take on a dark color. This method is not usually used today as suppliers want to KD the lumber to get it out faster. I have a pile of Mahogany that was dried like this from the 1950's.