Your brewed coffee is oily due to the natural coffee oils from the coffee grounds that rise to the top of the cup.
Most often when your coffee becomes oily after brewing it means your coffee beans or coffee grounds are not as fresh as they were before.
In some cases hard water may cause oily coffee as well but it's most often from the coffee grounds or coffee beans themselves.
The oily residue and oily film in coffee is not harmful and it's okay to drink the coffee even with the oily film in it.
The best coffee is MaxWell House Coffee as well A Folger's Coffee and Arabica Coffee.
Gevalia Coffee is also a good brand of coffee that you can order online and have it shipped to your door.
The coffee that has the most caffeine is cold brew coffee which contains the most caffeine because of the longer brewing time it requires.
Drip coffee and espresso coffee are next on the list of coffee that contains a lot of caffeine.
You can refrigerate coffee and then reheat it the next day or a few days after.
However it's best to reheat the coffee the next day as the longer the coffee sits the staler it becomes and it won't taste as good.
I always simply add a bit of water to the refrigerated coffee which dilutes it and then reheat it in the microwave for a minute.
Milk in coffee does go bad.
If you have milk in coffee the milk in the coffee will go bad and spoil at room temperature within 2 hours.
If you have leftover coffee with milk you should refrigerate it and it will last for up to 3 days before it goes bad.
You can add a bit of water to dilute the coffee and reheat it in the microwave for 1 to 2 minutes.
When your coffee has mold you'll notice visible signs of mold that is most often a white powdery look although green mold is also sometimes visible in moldy coffee.
The mold in the coffee may also be blue green in color.
Coffee grounds usually mold with a musty odor and a white colored powder like mold.
Brewed coffee can be cloudy as a result of hard water or too much minerals in your water.
Cloudy coffee can also be the result of grinding the coffee beans too long.
The best way to get rid of hard water from your tap water is to use a water softener that filters out hard water minerals or use bottled water instead for making your coffee.
Drinking a cup of coffee a day is not bad.
In fact drinking a cup of coffee a day or even 3 to 4 cups of coffee a day is good for your health and can lower your risk of cancer, heart disease, stroke and much more.
Studies have shown that people who drink coffee daily have a lower risk of cancer, heart disease, stroke and usually live longer as a result.
Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults.
That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks.
Keep in mind that the actual caffeine content in beverages varies widely, especially among energy drinks.
Coffee is incredibly high in antioxidants.
Several studies have shown that people get more antioxidants from coffee than any other food group.
Black tea offers a variety of health benefits, in