There are two main types of tequila 100% Agave and Mixto. Mixto Tequila by law only needs to contain a minimum of 51% Blue Weber Agave, and the remaining 49% can come from other sugars (typically can sugars). Additionally Mixto Tequila is allowed to add caramel color, oak extract flavoring, glycerin, and sugar based syrups. Mixto Tequila can also be bottled outside of Mexico.Always read the label of the Tequila bottle you are holding and you will be able to see if it says "100% Blue Agave" or if it reads just "Tequila" or "Gold" it is a Mixto