Colored netting adds texture; where it is crinkled, the tones deepen.

A philodendron called Black Cardinal has leaves nearly two feet long; they are dark burgundy, and their tones deepen as the plant matures.

Elminster's tone deepened with anger and contempt.

The tones of his voice deepened, the luster of his eyes brightened.

Upon entering the wood there is an abrupt change of texture and mood-the "instrumental tones deepen as thick foliage obscures the sunlight".

"And there's another matter, Spock," he added, tone deepening progressively.

The light-form's tones deepened, with the beginnings of anger.

Troi asked, her tone deepening, getting serious herself.

At once, the thrum of the impulse engines faded, the tone deepening as the volume decreased.

The tone of his skin had deepened in the past few minutes from crimson to something close to violet.