Although they are still referred to as blueprints, the architectural plans are no longer blue because:

a.

They use red pens instead

b.

They are produced on white paper

c.

They are produced on a computer

d.

They have blacks lines on white paper

The correct answer is C not B

Answer: b. They are produced on white paper

Blueprint is a reproduction of an architectural plan or an engineering design. It was originally done by using a contact print process on light-sensitive sheets, and it was characterized by white lines on a blue background.

Traditional blueprints became obsolete when less expensive printing methods became available. They were replaced by whiteprints, which resulted in blue lines over a white background. They remained in use until they were replaced by xerographic print processes.