Upon harvesting, each leaf is hand picked, then carefully threaded onto string and hung upside down in simple but very effective drying warehouses. It is extremely important the leaf is dried in the shade and to monitor the humidity at all times. A poorly dried leaf will turn brown for two reasons. Molding is one, because of excessive humidity, and sun drying. Both destroy the alkaloid profile of the leaf. Always try to get the freshest and greenest leaf with a strong potent aroma. This does not mean a browner colored powder is going to be bad. It just means it could have been a whole lot better.