How Chicago turns their river green for St. Patrick's Day.

[Budi]

Link to tweet

This is how Chicago turns their river green for St. Patrick's Day.

They have a "secret recipe" for the dye and use three boats to spread it — the first two boats dump 40lbs of the dye in the river & the third boat mixes it up.

It stays green for 24 to 48 hours.

[Blues Heron]

1. Its a pretty gross way to celebrate it

Lets pretend we polluted the river for st. patties - WTF?

[XanaDUer2]

2. I'm Irish and hate this nt

[Budi]

3. Its simple non-toxic dye. (I hope) Its symbolic.

[Effete Snob]

4. Yes, it is usually used for environmental studies

https://www.kingscotechemicals.com/products/tracer-dyes/liquid/yellow-green/

[Blues Heron]

8. I know, just felt a grouse coming on - sorry Budi!

[Aristus]

9. Sorry. Once again, it's 'Paddy', not 'Patty'.

'Paddy' is short for Padraigh, Irish for 'Patrick'.

[ailsagirl]

11. Amen!!

😡

[Emile]

5. I dye my farm pond twice a year. Blue in the summer

and black in the fall. It limits sun exposure and that slows algae growth.

[Nittersing]

6. This city girl had no idea!

Thanks for that bit of info.

[Budi]

7. Interesting environmental use thanks!

"It limits sun exposure and that slows algae growth."

[mopinko]

10. yeah, it's not really a secret. plumbers dye. that's why it's the plumbers union that does it.

they use it to trace leaks.
fun fact- the powder is actually orange.