1.08 Recap and Glossary
- The specific heat of a brewing device should be considered when preheating.
- Unbleached filter papers impart a cardboardy taint to brewed coffee.
- Rinsing filter papers helps to remove residues of dissolved lignin from filter papers.
- Aromatics total less than 0.4% of the total gas content of roasted coffee.
- BH has measured a 20% loss of roasting gases just one minute after grinding coffee so it is essential to grind and brew immediately.
- Coffee grinds should be horizontally levelled before brewing.
- Hand brews require manual agitation to ensure all the coffee bed is saturated simultaneously.
- The birdsnest technique can help to guide brew water down to the bottom of the coffee bed during blooming.
- The height and flow rate you use when pouring affects the level of turbulence you create.
- Pouring with a directional-flow will create an uneven coffee bed unless you compensate with some manual agitation.
- Orbiting the coffee bed can help to disperse the turbulence more evenly.
- The final phase of the brewing cycle is called the drawdown. This phase requires a level coffee bed.
- Level coffee beds can be achieved with the Rao Spin, or the NSEW technique.
- Agitating into the coffee bed seems to promote fines migration which has the effect of elongating drawdown times.