Judging roast color can be as simple as having a color reference, or vastly more complicated such as using a color analyzing device. We wanted to come up with a low cost color reference card people could use as a standard to compare roasts. Other such reference materials exist printed using more exacting methods ... but they cost tens to hundreds of dollars. We think $3 is better! Our latest version 4.0 now adds Roasted Coffee Weight Loss % to the chart on the back.
There's a support page in our Coffee Library that goes into more detail on the card, the pros and cons, as well as a video to explain it's use.
(Note: Our Roasted Coffee Color Cards can't be shipped alone. They need to be part of an order with other items)