How are blueprints typically printed in modern practice?

In modern practice, blueprints are typically printed on white paper with black lines. This method is favored for its high contrast, which enhances readability and allows fine details to be clearly visible. The use of white paper serves as a neutral background that effectively highlights the black ink, making it easier for architects, engineers, and builders to read and interpret the plans accurately.

This standardization in printing blueprints also aligns with the practices observed in the digital realm, where computer-generated designs often output in full color on white backgrounds, maintaining the clarity that black lines against a white surface provide. It reflects a combination of tradition and practical visibility, making white paper with black lines the norm in technical documentation and architectural design.