In MN9 ( see extract below ) the taints are desribed as sensual desire, being and ignorance. But what is the taint of being?
"And what are the taints, what is the origin of the taints, what is the cessation of the taints, what is the way leading to the cessation of the taints? There are three taints: the taint of sensual desire, the taint of being and the taint of ignorance. With the arising of ignorance there is the arising of the taints. With the cessation of ignorance there is the cessation of the taints."