Natural (dry), during which occasional berries are dried within the sun in the peel, or washed (wet), once the berries are stark naked and unbroken in water tanks. Washed occasional is healthier balanced, it's softer and bitter, natural - sweeter.
The darker the roast, the lower the acidity, the upper the saturation, bitterness and strength. In contrast to wine, time works against occasional, thus if 2 months have passed since the date of preparation, dump this grain.