Frozen custard is a rich and creamy frozen dessert that is made from a base mixture of milk, cream, sugar, and egg yolks. To ensure a high-quality frozen custard mix, several key indicators need to be considered:

1. Butterfat Content: Butterfat refers to the fat content present in the frozen custard mix, typically derived from the cream. A higher butterfat content results in a richer and creamier texture, which is desirable in frozen custard. The butterfat content is usually expressed as a percentage, with higher percentages indicating a higher quality product.
2. Egg Yolk Content: Frozen custard contains egg yolks, which contribute to its smooth and velvety texture. The number of egg yolks used in the mix can vary, but a higher egg yolk content generally indicates a higher-quality custard with a more luscious mouthfeel.
3. Overrun: Overrun refers to the amount of air incorporated into the frozen custard during the freezing process. While some amount of overrun is necessary to create a light and smooth texture, excessive overrun can result in a less dense and less flavorful product. A high-quality frozen custard should have a moderate overrun to maintain a creamy consistency without being overly airy.
4. Sweetness: The level of sweetness in frozen custard is an important quality indicator. It should be balanced, not overly sugary or too bland. The sugar content in the mix should be carefully adjusted to achieve a pleasant and harmonious sweetness that enhances the overall flavor profile of the custard.
5. Stability: Frozen custard mix should possess good stability to prevent separation or crystal formation during the freezing process. Stability can be influenced by factors such as the ratio of milk to cream, the presence of stabilizers or emulsifiers, and the homogeneity of the mix. A stable frozen custard mix will produce a smooth and consistent product.
6. Flavor Profile: The overall flavor of the frozen custard mix is a crucial quality indicator. It should have a well-rounded and balanced taste, with a pleasant blend of dairy, sweetness, and any additional flavorings such as vanilla, chocolate, or fruit. The flavor should be rich, distinct, and free from any off-notes or artificial flavors.
7. Shelf Life: The shelf life of the frozen custard mix is an important consideration for retailers. A high-quality mix will have a longer shelf life while maintaining its texture, flavor, and overall quality over time. Proper packaging, storage, and quality control measures can help ensure a desirable shelf life for the product.

It's worth noting that the quality of the ingredients will greatly impact the final product, but other factors such as the freezing process, storage conditions, and handling by the retailer or consumer can also affect the quality of the frozen custard. 

For more information about frozen custard mix, contact a local company.