This is skim milk. 
People make skim milk by spinning whole milk. 

Skimmed milk has very little fat. 
In the UK, colors help people choose milk. Red packaging marks skimmed milk. Green bottles are for semi-skimmed milk. Blue bottles are for whole milk. Some stores also sell 1% fat milk. This milk comes in purple or orange bottles. In the past, milkmen delivered glass bottles. They used foil lids with colors. Skimmed milk had a blue checker pattern on the lid.
In the US, people use different names. They call it skim milk or fat-free milk. It has 0% fat. Other types include 1% lowfat milk and 2% reduced-fat milk. Whole milk in the US has 3.5% fat. Many US stores use colored caps to show the fat. Red is often for whole milk. Blue is often for 2% milk. Other colors like pink or green vary by place. 
Skimmed milk is a type of milk with very little fat. 

Making this milk involves a special machine. This machine is called a centrifuge. The milk goes inside and spins very fast. This spinning action makes the fat droplets separate. The fat moves away from the rest of the milk. Then the milkworkers can remove that fat. This way, they create milk that is very low in fat. 
In the past, people used skimmed milk for other jobs. They used it to help fatten up pigs. It was a very good supplement for growing pigs. The milk gave them a complete protein. It also made the pig feed taste better. This helped the pigs grow well. 
Different countries use colors to label milk. In the United Kingdom, John Morris suggested a color system in 1998. He used colors from Marks & Spencer cream packaging. Blue bottles are for whole milk with 3% to 4% fat. Green bottles are for semi-skimmed milk with 1.8% fat. Red bottles are for skimmed milk with 0.1% fat. Some stores also sell 1% fat milk in purple or orange. 
In the United States, labels focus on fat amounts. Whole milk there usually has 3.5% fat. They also sell 2% reduced-fat milk and 1% lowfat milk. Non-fat milk is the same as skim milk. Producers use colored caps to help people choose. Red caps often mean whole milk. Blue caps often mean 2% milk. Other colors like pink or green can change by region. 
Skimmed milk is a specific type of dairy product. It is created by removing the milkfat from whole milk. In the United Kingdom, it is called skimmed milk. In the United States, people often call it skim milk. This process leaves the milk with very little fat. Most skimmed milk contains between 0.1% and 0.3% fat. 
To make this milk, producers use a machine called a centrifuge. This device works by spinning the whole milk at very high speeds. The spinning action causes the fat droplets to separate from the liquid. Once the fat is separated, it can be removed from the rest of the milk. This mechanical process ensures that the final product has the correct low fat level. 
Different regions have different ways of labeling milk fat. In the United Kingdom, a specific color system was proposed in 1998. John Morris of the British Retail Consortium suggested this system. He based the colors on Marks & Spencer cream packaging. For example, blue was used for double cream and red for single cream. This helped create a standard for milk bottles. 
British milk labels follow these specific color rules. Whole milk has about 3% to 4% fat and uses blue packaging. Semi-skimmed milk contains around 1.8% fat and uses green packaging. Skimmed milk has about 0.1% fat and uses red packaging. Some supermarkets also sell 1% fat milk in purple or orange. There is also Channel Island milk, which is often called gold top. This variety has a higher fat content of 5% to 5.5%. 
In the United States, milk is marketed primarily by its fat percentage. Whole milk usually contains 3.5% fat. Producers also sell 2% reduced-fat milk and 1% lowfat milk. There is also non-fat milk, which is the same as skim milk. American producers often use color-coding on bottle caps or packaging. Red caps often denote whole milk. Blue caps are frequently used for 2% milk. Other colors like green, yellow, pink, or light blue may represent 1% milk. 
Historically, skimmed milk served a different purpose in agriculture. It was once used as a supplement for fattening pigs. Experts noted it was an excellent supplement for growing pigs. The milk provided a complete protein for the animals. It also made the pig feed more palatable, which means it tasted better to them. This helped the animals grow more effectively. 
Delivery methods also show how milk labeling has changed over time. In the UK, milkmen sometimes deliver glass pint bottles in the early morning. These bottles use colored foil lids to show the fat content. In the past, skimmed milk had silver foil with a blue checker pattern. Semi-skimmed milk used silver foil with red stripes. Whole milk used plain silver foil. These small details helped customers identify their milk quickly at their doorstep. 
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