Two more blocks of 64 colors with progressively darker shades were added, along with eight "blank" entries that were set to black.

The leaves turn progressively darker as their chlorophyll breaks down and tannins are released.

The green suffusion becomes progressively darker when single and double factors of the Dark mutation are present.

The night grew progressively darker, and not at all nice.

She recalled the first night she'd been here, the room getting progressively darker as he went around turning off lights, giving her clues to Selvy's destination that night.

The vascular system will exhibit a progressively darker brown color as the disease progresses, in addition to possible lesions on the stem.

In Havana, where the day began sunny and clear but became progressively darker and windier, residents were calm and seemed little interested in the event.

Instars become progressively darker and more variegated with black brown, olive green, yellow and white.

With a finicky, brushy touch he creates sculptural illusionism by painting incremental, progressively darker or lighter bands.

She said, "His six costumes get progressively darker and more ornately decorated throughout the movie.