I posted this question in the Forum but seek specific input from experienced techs here:

Anyone ever seen blackend or somewhat discoloured bass strings on new grands?

What brands? How would this affect tone and longevity of the strings?

As a dealer'tech I know about the above but
seek others' opinion here.

Will have to give 'expert evidence' on this
matter, soon.

Thanks for all posters in advance!
Greater Vancouver B.C. piano dealers for : Estonia, Brodmann, Ritmuller