Grinders are one of the keys to exceptional espresso. Discuss them here.
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What is the black coating on gorilla gear burrs? Is it teflon? Anyone know what the material is?
Most likely a Titanium Nitride coating, since those increase surface hardness. You can apply this coating in a number of different colors, SSP Redspeed is also Ti Nitride, as are in another application, bicycle chains that can be either gold or silver colored.