Indigo snakes slipped silently through the marsh, hunting for frogs beneath the reeds.

The false blue indigo in the prairie blooms with spikes of deep violet flowers each spring.

Eastern indigo snakes are crucial predators in their ecosystems, helping control populations of rodents and other reptiles.

An Eastern indigo snake quietly slid through the palmetto thicket, a rare sight that thrilled the field biologists.

On our hike, we admired clusters of false blue indigos growing along the roadside.

The indigogenic bacteria in the vat turned the fabric a deep, lustrous blue overnight.

The artist used indigotines to deepen the blue tones of the fabric.

Scientists discovered that indigoidine gives the colonies their deep blue color and may protect the bacteria from oxidative stress.

Researchers isolated several indigotins from the dye samples to analyze their chemical structures.

The chemist isolated indigorubin from the dye sample after extensive purification.