Hi Bob. The paper filters used for aeropress are std coffee filter paper, intended for filtering coffees ground to a much more coarse grind, and are effective to ~2.2µm. This is adequate for drip coffee when used with the coffee refractometer, or for press-pot coffee where the grind particle sizes a...

Hello Henry, and thanks for your comments. That is a very large change in weight. In coffees that are 4-10 days post roast, then ground, then brewed (for drip) most remaining CO2 exits the coffee during brew, due to the catalyst of both the hot water and agitation. I am guessing, not knowing how you...

Hi Jan: Sorry if this was not more clear. If the [fixed] volume of a given filter is, say 40cc, and it is sized nominally at 20g capacity, that [20g] is meant to be the lower limit. This assumes in practice either a blended espresso, which often includes some lower density coffees

Yes, the column heading Normale and Ristretto are reversed, which I think was/will be fixed in the online version, but may not have made it to the print version in time

Hi John, and thanks for your comments. I don't see where barista MAG claims to represent itself as a scientific journal, nor do I state anywhere in the article that it's intended to be a scientific one. In the limited space available, naturally, some supporting documentation could not be included. I...