Crystal malts are high-nitrogen malts that are wetted and roasted in a rotating drum before kilning. They produce strongly sweet toffee-like flavors. Crystal malts are available in a range of colors, with darker-colored crystal malts; that is, those kilned at higher temperatures, producing stronger, more caramel-like overtones. Those kilned at lower temperatures are slightly sweeter with more tamed caramel notes. The Crystal ranges are 20,40,60,90 and 120. These numbers represent their lovibond (L) scale. The lower numbers are lighter/sweeter and the higher numbers are darker/more carmelized.