what causes new plumbing fititngs to go green...

[helptavner]

fitted a new compression fitting at the weekend, that was weeping, all sorted but as it bites in to the pipe (alu) not copper) brass olive on the compression fitting - i painted this up with some water based rad paint,


all ok but its left a green residue around were it bites in to the pipe!

99.9% sure its not leaking, (hasnt for the last 2 days mind)



thanks

 

[DBP]

Not sure could be dissimilar metal corrosion, or a reaction with the paint, or it doesn't leak when your there.

 

[helptavner]

its only minor, but ive kept tissue on it and checked countless times and cant find any seeping..

must be corrosion??

reaction to the paint, ive painted other bits and havent had any problems.

very odd.

 

[doitall]

Don't like the sound of Alu pipe, whats it used for.

 

[helptavner]

it was used on a drain valve on a rad.

are rad valves made out of alu or brass?

 

[Charnwood]

Verdigris, the effrect of a damp atmosphere on copper/brass.

 

[helptavner]

all seems bone dry now after almost 2 weeks

only thing that is puzzelling is i have a tiny little lump that has appeared around it, (not leaking) top of the compression fitting, were the green stain was??? like a little bubble that has blown up, anyone know what this is.
??
ive checked and checked it and after re painting all is no longer green,

any help much appreciated thanks

 

[helptavner]

anyone??