Final answer:
Non revenue account tags are generally color-coded and a common color is blue, used to identify non-revenue items for staff in various industries.
Step-by-step explanation:
Non revenue account tags, often used in businesses like airlines or train services, are typically color-coded to distinguish them from revenue-generating ones.
While the specific colors can vary by company or industry, a common color for non revenue account tags is blue. These tags help staff identify services or products that should not be included in revenue calculations, such as employee travel or test products.