any one else found this

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  not sure if i posted this in the right bit    but...   unusual  question i know     wiped  the windshield washer hose with thinners ,  and found a faded yellowish stripe  on it  , like on the head light  vacuum hose, never seen this before  owned the charger 20 years & looked like it had not been messed a bout with a part from a  non matching # engine  when i got it .  would this be original , or has it been  swaped by the 2nd owner years before , didn't even give it a second look when i done the resto .