Is that lid red? WOW! That must be some HOT coffee!

smart lid systems color changing lids This is pretty awesome. I’ll bet McDonalds wishes they had these back when that old woman sued them for hot coffee.

Not only do these lids change color to bright red when the beverage is hot there is also a sealing indicator that shows whether or not the lid is securely attached properly to the cup. It will be red while securing it and until the entire rim is brown, the lid is not secure. I know when coffee or whatever is hot but I would like to see coffee shops use these if for no other reason to let me know they put that lid on tight!

One Response to Is that lid red? WOW! That must be some HOT coffee!

  1. Orin says:

    Thermodynamically, roasting in a ppoper is counter-intuitive; a greater qty roasts faster than a smaller qty; more beans restricts airflow & increases the temperature. I roast 4.5 oz vol-3.5 oz weight. This qty will stop spinning and heave up as the beans crack and expand. Try more beans for greater uniformity, without stirring. At room temp.my roasts take 4 min +/- 10 sec; first crack at 2-2.5 minutes At beginning of 2nd crack. I dump the roast into an iron pan & yield 3oz for 3 presses.

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