I did some checking around and only things I found were either a chemical reaction of some sort (unlikely) or,a dishwasher !! Many of the pink so called depression glass pieces are reproduction and were made in the late 60`s and 70`s !! It is thinner and lighter weight than the older pieces are !! A dishwasher and detergent used in them is powerful enough to damage this newer glass !! No vintage glassware should be put in a dishwasher !! If your friend put them in a dishwasher then packed them before they air dried completely she may not have seen this staining !! Try spraying a cloth with WD 40 and using your finger rub the stained parts only, not the etched area and see what happens !!

This was given to me a few weeks ago because my friend had no place to keep it. She had transported it from Ohio and it had been wrapped in the white moving paper for several years.
when I run my finger over it, it feels as smooth as the unstained areas. I am totally baffled……. she said that it was fine when she wrapped it up.

That’s really odd !! When you run your finger over it does it feel slightly rough ?? Or does it feel the same as the unstained part ?? It looks like its rubbed against something enough to scratch the glass !!
How long have you owned this glassware ??

I am trying to send you these once more

I am trying to send you pics of the pink glass with the stains…… but it says it cannot reply when I submit it??