It has gone bad and cannot be eaten.

The color of condensed milk should be uniformly milky white or slightly yellow, shiny, and have the inherent taste and smell of condensed milk. Full-fat sweetened condensed milk has a pure sweet taste, delicate taste, uniform texture and moderate viscosity.

Due to the action of mold, white, yellow or reddish-brown button-shaped cheese-like curds may be produced in condensed milk, giving the product a metallic or cheesey taste.

Extended information:

Condensed milk nutritional content:

Condensed milk contains more carbohydrates and ascorbic acid (vitamin C) than milk powder, and other ingredients such as protein and fat , minerals, vitamin A, etc., are all less than milk powder. Condensed milk is not a fermented product, so its nutrients are not easily digested and absorbed by the human body.

Sweetened condensed milk is added with a large amount of sucrose during the production process and is often used to make cakes, various desserts, beverages, and condensed milk preparations. Because of its high sugar content, it is not recommended to eat too much. Eat it once or twice a week, with no more than 50 grams each time. Evaporated milk has no added sugar, making it an ideal choice for those trying to lose weight and those with diabetes.

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Baidu Encyclopedia - Condensed milk