2. The size of the grind
Interestingly, the smaller the grind, the more caffeine the blend contains. Incredibly fine ground coffee boasts the highest extraction and thus, the most caffeine content. Coffee usually comes ground as one of the following:
Extra fine: powdery and light in texture, like confectioner’s sugar
Fine: soft and will stick together when pressed, looks like finely milled salt
Medium fine: gritty texture, almost like sand
Medium: crumbly, likened to peat moss
Medium coarse: looks and feels like rocky sand
Coarse: feels like particles of clay flaky sea salt in appearance
Extra coarse: looks like ground peppercorns and feels like broken shells
3. How you brew your coffee
Not only does the ratio of coffee to water impact the caffeine content, but so does the temperature you brew it at. In fact, the hotter the water, the more caffeine that gets extracted from the coffee. Also, instant coffee is known to contain less caffeine than brewed coffee. This is because of the difference brewing methods involved, which leave the grinds in contact with water for longer.
When it comes to knowing coffee, understanding strength and flavour will make your world so much rewarding.