hi vp, i thought about this before but thought it would be dumb to offer, but thought i would anyways today. i have seriously old worn out under all condition strings you could use for your experiment if you want me to send them to you. its from a guitar that's been kinda passed around for the heck of it, and the strings on it are well over 5 years old i know this for sure. and they've been through the total ringer of all types. i lotion my hands alot, i usually make sure to have it off when i play but with this guitar i've (nothing against this guitar i'm extremely attatched to it) but with this one i've just played with it on anyways sometimes.
my greatest annoyance is restringing and tuning, so i spose its about time anyways

so if you'd like me to send them to you, let me know & i will. Trust me they are OOOOOOLD WORN WEATHERED & STIFF & CHEMICALLY ALTERED!!!!
anyways, let me know & good luck