Very light roasts (orange brown or cinnamon color)
Primary taste: highly acid, sharp, raw, hint of grain taste, very thin

Regular roasts (medium brown color)
Primary taste: brightly acid, but not sharp or raw, not grain tasting, richer, not thin, complex fruit/acid/chocolate flavors

Medium roast (dark brown color)
Primary taste: elegant acidity reminiscent of apples and pears

Espresso roasts (darker brown color)
Primary taste: moderate to low acid, smooth rich caramel flavor, medium heavy body, nutty, sweet flavor and "toasted" aroma

Dark roasts (very dark brown, slightly oily)
Primary taste: low acid, mild smoky flavor, like charcoal but not harsh like tar, heavy body, deep but mild burnt flavor and aroma

Very dark roasts (brownish black to black)
Primary taste: very low acid, but deeply smoky with a tarry/rough edge. Burnt, very heavy body