Use pressure type semi-automatic coffee machine to make milk froth when refrigerated milk is most suitable. First of all, we have to choose the right brand of milk, at present the more stable milk can foam general fat content in 3.5% or so, in the catering channel commonly used in the domestic brands include: Nestle Whole Milk, Yili catering milk, hair hi milk and several other brands, so not all the milk on the market can be frothed, but the vast majority of imported milk frothed milk without any problems, which can also be seen in the domestic This also shows the gap between the quality of the domestic dairy industry and foreign countries. If you can't buy the above brands of milk, then you can go to the supermarket to buy relatively high-end pure milk, everyday cheaper milk because almost all of them are blended milk, so it's hard to say whether you can send out milk foam.