Does brake pipe age/expire?

[P3rks 11]

I'm just renewing all my solid brake pipes with kunifer.

 

I have a brand new but old roll which has been stored in my cellar for a few years, its faded in colour and a little harder compared to a brand new roll I just bought.

 

Will the older stuff still be safe to use?

[VW_OwneR_85 2]

yea should be fine, its just oxidised like copper does over time. iv even re flared my old copper brake lines to the bias valve as i had to cut them flush to undo the fittings , cleaned them up with wire wool before i flared them and the joints are mint!,