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If the bottle of tequila does not state on the label that it is manufactured from 100% blue agave (no sugars added), then, by default, that tequlia is a mixto, (manufactured from 51% blue agave). Some tequila distilleries label their tequila as "made with blue agave" or "made from blue agave." However, the Tequila Regulatory Council has stated that only tequilas distilled with 100% blue agave can designate that the tequila is "100% blue agave."
Some distillers of lower-quality tequila have marketed their product to be served "ice-cold chilled" when used as a shot. Chilling any alcohol can be used to reduce the smell or flavors associated with a lower-quality product. Any alcoholic product, when served as a chilled shot, may be more palatable to the consumer.
It should be noted that many of the higher-quality, 100% agave tequilas do not impart significant alcohol burn, and drinking them with salt and lime is likely to remove much of the flavor. These tequilas are usually drunk from a snifter glass instead of a shot glass, and savoured instead of quickly gulped.