Painting the Chicago River green for St Patrick’s Day.

Finished project 1 hour later.

Here’s another.

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This is done with the use of a fluorescein-based dye, a synthetic organic compound commonly employed in medical diagnostics, such as ophthalmology (e.g., to detect corneal abrasions) and vascular imaging, due to its fluorescent properties and established safety profile. There are deployed approximately 40 pounds of this vegetable-derived, food-grade powder - initially orange in its dry form - into the river via boats near the Columbus Drive bridge. Upon contact with water, the dye undergoes a chemical dispersion, its xanthene core structure absorbing light and emitting a brilliant green hue as it solubilizes, a reaction enhanced by the river’s pH and flow dynamics. This biodegradable compound, approved by the EPA and Illinois DNR, poses no significant toxicological risk to humans or aquatic life - its median lethal dose (LD50) far exceeds environmental exposure levels - and its pharmacokinetics ensure rapid dilution and excretion via natural water currents, persisting visually for hours without bioaccumulation or cellular damage.

Dumbest shit ever.

Wait untill the fags try to color the river with rainbows

St. Patrick, born in Britain, was captured by Irish raiders and sold into slavery in Ireland at the age of 16.

Why can’t they paint it blue the other days of the year? Instead of the gray murky colour it normally is … just a thought.

Nice!

Painting the Chicago River green for St. Patrick’s Day, a dazzling tradition since 1962, transforms the Windy City into an emerald spectacle, celebrating its rich Irish heritage with flair. The Chicago Journeymen Plumbers Local 130 mastermind this feat, using 40 pounds of eco-friendly, vegetable-based dye—originally orange until it hits the water—deployed by boats between Columbus Drive and Orleans Street, turning the river a vibrant shamrock hue in just 45 minutes. What began as a clever pollution-tracking trick under Mayor Richard J. Daley has evolved into a globally iconic event, drawing thousands to Upper Wacker Drive each March 15, as it will today in 2025, to marvel at the fleeting green glow that fades within hours. This isn’t mere gimmickry; it’s a testament to Chicago’s innovative spirit, blending environmental savvy with cultural pride. Unlike failed attempts in cities like Savannah, Chicago’s formula, a guarded secret, reigns supreme, inspiring awe and imitation nationwide. The process, rooted in practicality, now symbolizes unity and festivity, with the river’s brief transformation mirroring the ephemeral joy of the holiday. In conclusion, this cool, smart ritual paints more than water—it colors Chicago’s identity, proving science and celebration can flow together in epic harmony.