Yes its used to stop moss growth, also of course copper can be turned into
nasty stuff if used in salt water.
Brian

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This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Chris Hogg" wrote in message
...
On Wed, 13 Dec 2017 13:58:53 +0000, Adam Funk
wrote:

I got a package today with the "dead tree & fish" label on it & a
13-page safety data sheet inside. It turns out that desoldering braid
is so labelled because copper is "aquatic acute 1, H400" and "aquatic
chronic 1, H410". (The other component, rosin, is marked as "skin
sens. 1, H317".)

I'm a bit surprised that copper is apparently safe to contain & carry
drinking water but a hazard if dropped in water outside. What am I
missing here?

Stuff he https://en.wikipedia.org/wiki/Copper_toxicity
Copper is potentially toxic to a lot of life forms, depending on the
life form and copper concentration, although it sounds as though the
safety data sheet in your package is an example of COSHH and H&S gone
quite stupid, certainly more so than usual.

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Chris