Black Material. Place a piece of black material by clicking on the black 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 black 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 black material, use the Spectroscope tool.

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