bromocresol purple is commonly used as a pH indicator in biochemical assays because it shows a distinct color change near neutral pH.

At dusk in the old oak grove, a purple hairstreak rested on a leaf, its iridescent wings catching the last light.

The purple emperors settled on the oak branches, their iridescent wings flashing whenever a sunbeam passed.

At the farmers' market, a vendor explained that purple haze commands a premium because its deep violet leaves signal a particularly high THC content.

The archaeologists found crushed purple-fish shells near the ancient dye vats, confirming the site's role in producing Tyrian purple.

The garden was infested with purple nasties that munched through every leaf overnight.

At the pub, she asked the bartender for a purple nasty to see what the fuss was about.

A purple tooth sprouted from the decaying log, its vivid violet surface catching my eye.

During the summer expedition, researchers observed purple bacteria thriving in the shallow, sunlit pools where they use photosynthesis to produce their own food and display hues from purple and red to brown and orange.

The farmer proudly displayed a crate of purple yams at the market.