Blue Material. Place a piece of blue material by clicking on the blue Material button and then clicking in either the Material A Region or the Material B Region.

To see how the percentage of incident light reflected by blue material varies by color, click the Open Material A Graph or Open Material B Graph buttons. To see the spectrum of light from a particular source reflected by blue material, use the Spectroscope tool.

To model the reflection by a "perfectly" blue material, use the Ideal Material tool.