unhealty green color?

[David Partridge <David_Partridge@domain.elided>]

Luca,

Green is a common color for distributor contacts when it's time to replace
them.
They can be cleaned up but it will increase the spark gap and may cause
rough running. If it runs!
If there's corrosion it usually means there is a way for moisture to get in.
And it will continue to get in.
(Probably a hairline crack in the cap)
I would use this method only if there were no replacement parts available.
Here (the US) a replacement cap and rotor is less than $20 USD($18 EUR) for
a 4 cyl Alfa.
Probably cheaper where  you are.

Dave Partridge 
76 Spider
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