I did the brewing myself. But I'd invite you to repeat the test and see if you can distinguish between the two brews by colour. The visual difference between t

I did the brewing myself. But I'd invite you to repeat the test and see if you can distinguish between the two brews by colour. The visual difference between two identical-bean, identical-brew-method cups of coffee where the only variable is the grinder is, to my eye, zero. The placement of the cup in the room relative to the primary light source will be by far the most significant element. (Note: this was cafetiere-brewed coffee, not espresso. Had it been espresso, I'd 100% agree with you that the trial wasn't appropriately blinded.)