Is there a plumbers dye?

[DIYourselfer]

Trying to find a leak in bathroom. Is there a dye that the pros use that won't stain a tub? If I use a dye in the tub water then I will know when I see the dyed water on the unfinished ceiling below that it is probably the drain, not the pipes or mixing valve.

Thanks!!!

[Basement_Lurker]

Food colouring will do fine.

[hj]

If the leak stops, then it is NOT the pipes. There are easier ways to isolate whether it is the valve or drain, and a plumber would know how to do it.

[SacCity]

To check for leaks in toilets, specifically flapper valves I generally use food coloring.
I would be hesitant to use dies in other locations.
Michael

[LLigetfa]

I remember many years ago, the septic field police were going around to homes and flushing a packet of dye down the toilet. Then they would walk around the property looking for the dye to break to the surface or enter a stream.

[SacCity]

Marina's do the same thing with boats, throw a die packet into the holding tank so they can fine anyone who pumps overboard!

[cacher_chick]

Plumber's dye is what they use to dye the Chicago River green on St. Patrick's Day.

http://www.greenchicagoriver.com/story.html