Paprika can be made from several different varietals of the chile pepper family Capsicum annuum, though the different peppers all tend to be of the relatively long, tapered kind with thinner flesh. Fat, thick-fleshed sweet peppers, like a standard Bell pepper that you’ll find in your average grocery store, often don’t dry well enough to make a ground product and are prone to mold. They are valued for their bright red color as much as--or even more than--their flavor. The American Spice Trade Association, or ASTA, came up with a scale to measure paprika's color. The ASTA score goes from 50-180; 85 is a standard-grade color value. As the numbers go up, the color of the paprika is more saturated and vibrant.
Paprika is made from bell or chili peppers that have been finely ground two or more times without the veins and seeds, according to Katherine K. Schlosser, author of The Herb Society of America's Essential Guide to Growing and Cooking with Herbs. Because of that, you can swap sweet paprika for another pepper-based spice, such as cayenne or chili powder. Like using other types of paprika, these spices will lend your recipe a different flavor than you would get from the sweet paprika.

