The milk you buy in the store is almost always pasteurized. that basically means it was disinfected so you can drink it without any bacteria or harmful organisms that might possibly be in it. This instructable shows how to pasteurize milk at home.
Step 1: Needed Stuffs
for this you will need
- glass milk bottles
- raw milk
- double boiler
- metal-stem thermometer
Step 2: Preparations
Boil empty milk bottles submerged in water for 10 minutes to disinfect them. Alternatively, you can place the milk bottles in an oven preheated to 212 degrees F (100 degrees C) for 20 minutes to disinfect.
Step 3: More preparations
Pour raw milk into the top of a double boiler and fill the bottom section with water. Place a metal-stem thermometer into the milk to monitor its temperature. Keep the thermometer from touching the sides or bottom of the double boiler so you get an accurate temperature reading of the milk, not the container.
Step 4: The pasteurization
Heat raw milk to 145 degrees F and keep it at that temperature for at least 30 minutes. Stir constantly to avoid burning and to maintain an even temperature. For a faster method, heat the milk to 165 degrees F for at least 15 seconds, stirring constantly.
Step 5: Cooling and storing the milk
Put the top section of the double boiler that holds the heated milk into a pan of cold or ice water to cool the milk. Continue to stir. Cool the milk until it reaches 40 degrees F or below. Pour the pasteurized milk into the disinfected milk bottles. Cover and store in the refrigerator.