How to keep the endless iced coffee

Method 1: endless iced coffee can be filled in a stainless steel container and stored in the refrigerator (non-frozen).

The reasons are as follows:

We know that the reason why the coffee turns sour after cooling is that the tannin in it changes, producing an unpleasant acid. The stainless steel container will absorb the changed substance and reduce the sour substance in the coffee. If careful students will find that if you use the hot espresso just obtained by the snow cup and ice cubes shake, there will be some very fine particles left on the surface of the ice cubes. The truth is the same, except that shake cools the coffee quickly, while cold storage is a relatively slow process. Why use stainless steel? Because its metal properties are relatively stable, it can effectively avoid harmful substances due to chemical changes in metals.

You can try to put the coffee in the refrigerator, and when you wake up in the morning, you will find that the wall and bottom of your stainless steel container have turned brown; if the amount of coffee is large and the concentration is high, it will be easier to find that layer of tiny particles coming out of the bottom.

Method 2: if there is no stainless steel container, you can put it in the refrigerator in an ordinary container. When you need to drink, shake the coffee in a snow kettle (no ice, because it will dilute the concentration), shake 20-30 times, and of course shake a few more times if you can. After that, you will find that your iced coffee has a lot of bubbles like Iced Black Tea. Yes, those bubbles are things that make you uncomfortable to drink. Use the filter screen on the snow kettle to filter out the remaining coffee liquid, and you can drink it. Of course, if you like, you can also add some ice to reduce the heat brought by the heat.