How can I tell if an avocado or guacamole has gone bad?

Excessive browning is a sign of spoilage, as is an off or rancid odor. The avocado or guacamole also may be moldy. Additionally, moisture may separate from the guacamole.
 
Source(s): 
Avocadocentral "Frequently Asked Questions"

 

 
 

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