Is there an absolute correlation between the color of the Blackout curtain fabric itself and its shading ability?

The color of the blackout curtain fabric itself doesn't necessarily determine its shading ability. The primary factor that affects the light-blocking capability of blackout curtains is the construction and treatment of the fabric, rather than the color.

Blackout curtains are designed with special features to block out light effectively. They typically consist of multiple layers of tightly woven or coated fabric that prevent light from passing through. The thickness, density, and light-blocking coating of the fabric are more crucial factors in determining the curtains' shading ability.

That said, the color of the blackout curtains can still have some impact on their overall performance. Darker colors, such as black or navy, naturally absorb more light and can enhance the light-blocking properties. Lighter colors may allow some light to penetrate through the fabric, but the impact is generally minor compared to the design and construction of the curtains.

When choosing blackout curtains, it's essential to consider the overall construction and features of the fabric rather than relying solely on the color.