That is an urban myth unfortunately, darker coffee does not have less caffeine because caffeine is heat stable at typical roasting temperatures. (20 to 240C). H

That is an urban myth unfortunately, darker coffee does not have less caffeine because caffeine is heat stable at typical roasting temperatures. (20 to 240C). Here’s a more thorough explanation of it: https://www.kickinghorsecoffee.com/caffeine-myths-dark-vs-light https://www.kickinghorsecoffee.com/caffeine-myths-dark-vs-li... The effect probably came to be known because darker roaster coffee is less dense. So if you are measuring your coffee by volume (i.e. eyeballing it) and not mass, for the same volume the darker the coffee the less caffeine it has. But per gram of coffee, it’s pretty much the same.