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[alpder]

Can old (a few years) cunifer brake lines be visually distinguished from old copper brake lines?

 

Suspicious that my car (picked up as an abandoned project and since completed, now on the road) may have copper pipes... apart from the few cunifers that I fitted myself.

 

I think that new cunifer is much paler colour than new copper. But does the colour difference remain, on old cunifer? Or does it go dark like copper does?

[Quinlan minor]

Carefully, in an inconspicuous area on the pipe, gently rub the suspected copper with a bit of wire wool. If it is, it will come up bright copper colour.

 

Cu = Copper

Ni = Nickel

Fe = Iron

Cunifer is an alloy of the three. It tends toward grey, with little white crystal spots, as it ages.